Yes, I've run three applications on GAE so far, and they've all worked quite well.

My blog, which uses a system I wrote on GAE (serves posts, admin controls, etc.) features an App directory, which was recently popular on some social bookmarking sites, and so had quite a heavy load of traffic on the site. It held up and scaled really well - meaning there were no latency problems, etc. (although I had one or two functions that were burning up the daily quota quite quickly which I had to remove).

I've been very impressed with the system so far - I've been writing a blog about my 'journey to mastery' using the combination of Python, Google App Engine, and Django. I've had to pay no fees at all to use the service, which is a big help when you're writing your own software for a blog!

Hope that gives you some confidence.
- pythoughts
Source(s):
Own experience

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