Has anyone used paste? What differentiates paste in your opinon?

That looks quite cool. It looks like a formalization of WSGI application techniques, rather than anything entirely novel, but it's simplicity is very appealing. The examples are impressively tight...not a lot of extraneous crap required to fire up an application.

Paste is a toolkit for building WSGI apps. There's nothing else quite like it. I use it a lot, both by itself and as a part of Pylons.

The best thing about paste is that you can also eat it when you've been working on your app for awhile.