I got 42 "internal server error" messages (error 500) in about 4 minutes just now. App Engine isn't supposed to be having any problems:

http://code.google.com/status/appengine

James

I'm not seeing anything abnormal; was this while practicing? Are you still seeing any?

Also, you can't always look at the main status page; sometimes there is an issue in the Python serving that isn't visible from the top. So in this graph, I do see some momentary weirdness:
http://code.google.com/status/appengine/detail/serving/2010/11/19#ae-trust-detail-helloworld-get-latency

Yes, it was from the practice page. Seems fine now...

Nope, acting up again (19 server errors in 16 min)

I am also having quite a bit of trouble today. Most of the time, Skritter is fine. Lately, there have been a lot of problems...

Sorry guys. I am pretty frustrated with the intermittent error surges on App Engine's end. They'e recently announced a bunch of new features in an upcoming release, though, one of which may make many of these errors go away. I've got my fingers crossed for that!

awww man, I can't get on the site for longer than a couple of minutes at a time.....

this has to stop

Idem here, and many times too much waiting (2-3 minutes) to move on.

Had same problem but didn't last long.