I've been keeping half an eye on web2py for a while, since it seems to fill a previously untapped niche in the web framework world (TTW development without a lot of complexity).

I decided to check up tonight and I have to say I'm amazed. I'm mildly leery of the fact that it uses a custom ORM rather than SQLAlchemy (SA seems sufficient and is rapidly becoming the de facto Python ORM), but overall, web2py seems to offer a rather appealing way to manage web applications.

I was especially impressed by the number and quality of appliances built on top of it (and the fact that many of them are from third parties is encouraging).

I was also pleased to see that it supports alternative template engines (so I could use Breve with it if I wanted to [and I do]).