I created the following application for Facebook (using Yii) : RSS Feed It!
It allows you to publish your feeds (home, wall) as a news (RSS) feed, that you can use on any news reader, without having to be logged in @ Facebook. Uses an ‘advanced’ privacy setting system (global option + per friend)
It took me only about 3 days to code this in Yii! (I did have a more raw version before using my own framework, so I had alot of the code logic figured out already, but still…)
Any feature requests, bugs, comments : post them here 
I first used PRADO before, and was ‘scared’ to use Yii, but I’m over that scare now 