I'm not that familiar with CouchDB-only apps but it seems to me that with node you get access to any number of other libs/technologies you may need. What if you

I'm not that familiar with CouchDB-only apps but it seems to me that with node you get access to any number of other libs/technologies you may need. What if you want to aggregate a twitter feed? Connect to MongoDB for logging? Memcache? Do some image generation/processing? Websockets? Etc.