You have to think about how you get access to YOUR data that is stored in this 'cloud' and how easy is it to get it back if you want access to it. You also have to consider how much data and does it cost anything to store it and will the cost go up as storage goes up? That's my main concern with Cloud Computing in general.

When it comes to 'virtual desktops', you have to consider what kind of support you are getting and how fast can you get access to it. Is there a Service Level Agreement when it comes to Support and Maintenance? As with any software and infrastructure, upgrades are a big question. Also, is there a choice in software used on the Virtual Desktop? If not, it might mean training for some users. Some people are use to IE only and not Firefox, some people have used Outlook and never used Lotus Notes.

You lose some flexibility and control when you go with cloud computing. With desktop virtualization, my opinion is that that is too much control to give up.

What about hardware replacements, how fast will that occur? If it takes 24 hours, does that mean the employee will have nothing to do for that time? What's the cost of having that employee do nothing for 24 hours. And who will set up the machine? Does it cost anything for having someone come out to provide service?

In a nutshell, I don't think its worth it to go with an Online Virtual Desktop, maybe in the consumer market, but not for any type of company, small medium or large.

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