I could have written this script myself... but it probably wouldn't have integrated as nicely into the reader UI if I had done it. This a very nice, clean, and simple script. It works exactly how it should. The code is also laid out very cleanly, which allowed me to make changes, mostly related to using is.gd for short URLs instead of TinyURL.

author: you might want to consider using is.gd for short URLs instead of TinyURL... the URLs are several characters shorter and the API is simpler (no regexing the response page from tinyurl, is.gd returns nothing but the URL if you use their API). I can provide my changes if you want, but obviously looking at your code I'm sure you could figure it out.

There are a couple bugs on my mac do to the updates on Google Reader and the fact that I am using Flock instead of Firefox, but all in all I absolutely love this script and couldn't live without it!