Couple of things to add:

• CouchDB-as-web-app-framework isn't quite as limited as you might thing. URL rewriting, for instance, is handled just fine, and there are tools for app development and distribution (like Kanso).


• CouchDB's brand of map/reduce is pretty limited, but a reduce function that produces non-scalar results is perfectly doable. It's only considered Bad Form because it's tricky to get right, and it's terribly easy to actually *accumulate* more data in your reduce result and end up with thrashing machines and giant view indexes and other Bad Things.

Quibbles aside (as you note, I have used CouchDB a lot in the last few months), great post!