Google App Engine Twitter Bot will take feeds from yahoo pipes, parse them, check for duplicates and post them to a twitter account in a twitter friendly manner (throttled, so that we don't overload twitter).
It will also shorten the urls it gets using a few different url shortening services bit.ly, u.nu, and is.gd.
Once setup the whole thing runs automatically, very hands off.
I built this as a way to get familiar with google app engine and the twitter api, and the new things in google app engine crons and queues.
I am now releasing it to all, so that everyone can see what I did, and learn from it and improve it. Enjoy, Ken Cochrane