AppEngine is great for rapid prototyping, but it still has several limitations that make me hesitant to base a real infrastructure off of it. I've used it for

AppEngine is great for rapid prototyping, but it still has several limitations that make me hesitant to base a real infrastructure off of it. I've used it for http://www.minehub.net http://www.minehub.net, http://www.quickcite.it http://www.quickcite.it, and a few others.