Looks like it's great for building the things the authors thought you might want to build. Just like every other "SuperMagic" framework, I suspect there's a lot of pain to be had once you step just a little outside of what it expects you to do with it. We've all re-written Django inside of Django at least once, and thus have been burned by this sort of thing before. Personally, I think I'll wait to see some big proje…
I've been using Django for a lot of projects, but have recently converted to Rails 3 for a personal project. What I like about Rails is that plugins are mostly pieces of infrastructure, not ready-to-use mini-applications that are hard to customize. And Rack plugins (pieces of middleware, done in a standard/reusable way, contrary to Django's middleware) are just awesome. I also like about Rails that authentication and…
I think you're talking about rack middlewares. Rake is the Ruby make.