I'm having this problem.
This IP has exceeded the request-per-day limit
I hardly believe that with StackPrinter, I'm depleting 10.000 requests per-day, per-site :).
Could you please verify?
it's started to work again
down again :(
There are a number of [app]s using Google App Engine, like StackPrinter.
Unfortunately, you're all using the same pool of IPs. Thus, you're all on the same quota.
If you can introduce a proxy or forwarder of some manner to your [app], you can solve this problem.