Very little found in my searches about Las Vegas. If you still don't have enough I would suggest scanning directly some of the websites of any local university or business to see if anything is maybe there but blocked from search engines. Alternatively, perhaps you could contact local universities/colleges and see if anyone can send you any info about their cloud computing etc. Not sure if that would work for casinos - some seem like they don't talk about their computer systems with the public perhaps for security. Good luck.

The Information Factories
The desktop is dead. Welcome to the Internet cloud, where massive facilities across the globe will store all the data you'll ever use. George Gilder on the dawning of the petabyte age.
http://www.wired.com/wired/archive/14.10/cloudware_pr.html

Microsoft's Surface goes to Vegas (does this use cloud computing?)
http://www.builderau.com.au/blogs/syslog/viewblogpost.htm?p=339270989&feed=pt_government

Viva Las Vegas! Managing the country's biggest private project ever (looks like it must be cloud computing)
http://www.computerworld.com/action/article.do?command=viewArticleBasic&taxonomyName=Project+Management&articleId=317005&taxonomyId=73&pageNumber=1

Casinos Hit Jackpot With Customer Data (not sure, does not look like cloud computing)
CRM leaders keep detailed dossiers on loyal gamblers
http://www.computerworld.com/action/article.do?command=viewArticleBasic&articleId=61799

Cloud Computing, Second Life and the University Sept 2008 (download free document)
http://www.docstoc.com/docs/3409868/Cloud-Computing-and-the-University-September-2008_1

Obama's CIO: "I'm all into the Cloud"
http://www.ideationcloud.com/2009/03/obamas-cio-im-all-into-the-cloud/

Cloud hosting awareness survey (pdf)
http://www.rackspace.com/downloads/surveys/CloudAwarenessSurvey.pdf
The Newspaper Cloud?
http://www.datacenterknowledge.com/archives/2009/03/05/the-newspaper-cloud/

Cloud computing and leadership search at TechRepublic
http://search.techrepublic.com.com/search/cloud+computing+and+leadership.html

Case Study: Project and Resource Management Cloud Computing with Project Insight
http://www.wwpi.com/software-/software/6366-case-study-project-and-resource-management-cloud-computing-with-project-insight-

New Site: Government Cloud Computing
http://www.datacenterknowledge.com/archives/2009/03/04/new-site-government-cloud-computing/

Computing in the Clouds
http://www.military-information-technology.com/mit-archives/65-mit-2008-volume-12-issue-10/493-computing-in-the-clouds.html

Success stories from Europe and Asia
http://aws.typepad.com/aws/2009/03/european-success-stories.html

Google 2-Sided Business Model Case Study
The 2-sided telecoms market realizing growth from the platform play
http://www.slideshare.net/bazza1664/google-2sided-business-model-case-study

Startups & the Cloud (slideshow)
http://www.slideshare.net/adilmd/startups-in-the-cloud

(not case study but they say one of few research papers available on cloud computing Feb 2009)
Above the Clouds: A Berkeley View of Cloud Computing
http://www.hpcwire.com/features/Berkeley-Releases-Cloud-Computing-Study-39502692.html
Same: html document
http://www.eecs.berkeley.edu/Pubs/TechRpts/2009/EECS-2009-28.html

Skynet Lives!
http://blogs.smugmug.com/don/2008/06/03/skynet-lives-aka-ec2-smugmug/

InfoQ Case Study: NASDAQ Market Replay
http://www.infoq.com/articles/nasdaq-case-study-air-and-s3

IDC Says Cloud Computing Is More Than Just Hype; Worldwide IT Spending On Cloud Services Expected To Reach US$42 Billion By 2012
http://idc.com/getdoc.jsp?containerId=prSG21724009

UniCloud Case Study: Amazon's EC2 Cloud (online order form)
http://www.univaud.com/hpc/cs-data-processing-amazon-ec2.php?utm_source=google&utm_medium=cpc&utm_campaign=private%2Bcloud%2Bgroup&source=google%20ad

Cloud computing: Supercomputers for hire
Cloud computing can provide all the processing power your company needs for little money, but be ready for rough weather.
http://money.cnn.com/2009/02/03/smallbusiness/cloud_computing.fsb/index.htm

Azure Services Platform Resources: Case Studies
http://www.microsoft.com/azure/casestudies.mspx

Case Studies In Cloud Computing
http://www.informationweek.com/cloud-computing/blog/archives/2008/09/case_studies_in.html

What possible computer disasters can be associated with cloud computing?
http://knol.google.com/k/zack-whittaker/what-possible-computer-disasters-can-be/31srvq0di293e/2

Nonprofit & Public Sector salesforce.com
http://www.salesforce.com/customers/education-non-profit/

Hi-Tech Hardware salesforce.com UK
http://www.salesforce.com/uk/customers/hi-tech-hardware/

Financial Services salesforce.com
http://prerelwww.pre.salesforce.com/customers/financial-services/

Salesforce.com Touts Haagen-Dazs as Cloud Customer Saas InformationWeek
The ice cream company is using Force.com to support its franchised shops in mega malls, Las Vegas casinos, and Disney properties.
http://www.informationweek.com/news/services/saas/showArticle.jhtml?articleID=210300094

Gov't Agencies Embrace Cloud Computing
U.S. government agencies, at first slow to adopt cloud computing, are starting to see the benefits, including low costs and quick deployment, government officials said Wednesday.
http://www.cio.com/article/482333/Gov_t_Agencies_Embrace_Cloud_Computing?taxonomyId=168354

Taylor Woodrow heads for the cloud
Case study: Building company benefits from moving to Google Apps…
http://networks.silicon.com/webwatch/0,39024667,39257523,00.htm

Case Study: Fast, Simple Open-Source IT
To deliver top-notch customer service, online shoe retailer Zappos eschews the complex.
(quote from Tony Hsieh, CEO of Las Vegas-based Zappos.com Inc)
http://www.cioinsight.com/c/a/Case-Studies/Case-Study-Fast-Simple-OpenSource-IT/

Case Study: Mohegan Sun and the Future of Data Security
"But collecting data on customers' gambling habits is a delicate issue, particularly in a business where expectations of privacy are so strong that Las Vegas could turn "What happens here, stays here," into a marketing slogan."
http://www.cioinsight.com/c/a/Case-Studies/Case-Study-Mohegan-Sun-and-the-Future-of-Data-Security/

QuickBooks: By the Numbers
http://blogs.zdnet.com/BTL/?p=5088&tag=rbxccnbzd1

QuickBooks Enterprise: The forgotten mid-market ERP player
http://blogs.zdnet.com/BTL/?p=4672

asap online QuickBooks
http://www.businessasap.com/accounting/quickbooks/quickbooks_case.htm

QuickBooks Helps Web Designer Keep Up with Growth (pdf) (loads slowly)
http://www.e-websmart.com/f/quickbooks.pdf

Here are a few to get you started:

http://aws.amazon.com/solutions/case-studies/