Amazon is finally setting up persistent storage for EC2 instances. This means you can more reliably host a MySQL or PostgreSQL database on EC2. Never again will I have to buy more servers for my applications! See the forum post, the blog post and signup here.
http://dot.appspot.com/ is the first Google App I have seen to hit quota limits. Funny that Google App Engine is being billed as a way to build infinately scalable web apps, yet the quota limits are so small. You get around 500MB of storage and 10GB transfer. Only google gets a huge amount of attention when offering a small hosting service. You can get much more from a $6/month web hosting account from dreamhost (500,000MB storage, 5,000GB transfer).
It will be funny when the first Google App Engine application gets linked from digg and users see this “Over Quota” message.
If you want to discuss App Engine, join the new IRC channel I started on irc.freenode.net #appengine (23 members right now)