The Politwitter API currntly has 2 main functions, firstly to retrive detailed info on MPs and secondly let web developers incorporate various tweetstreams into their applications.
The politwitter API is available for use, but by request only at this point in time. Please contact me if you want more details and are interesting in using the API.
Federal Riding EDID API
I also have a simple API to lookup federal riding info by passing either the riding name or edid #. I created this because I couldn't find any existing API where I could pass the riding name and get the edid in the results.
Politwitter has a customizable widget you can use to easily include tweets on your website with.
There are also some basic RSS feeds available here.