Google Code provides various feeds for every project they host. The "Issue Updates" feed contains entries for all the issues on the project. What if you're only interested in one issue? Filter the feed with Yahoo! Pipes of course.

My pipe is an example of how easily this can be achieved with a simple regex in the Filter module. I've tied the name of the project and the issue number to user inputs, so you can use this pipe to track your favourite issue on your pet project. Personally, I'm looking forward to having support for Pie Charts baked into an official release of flot, and will be tracking progress with this feed.