It tracks tweets for new github.com repositories created this week, and posts them in a nice searchable list. It also displays languages used, collaborators and you can view readmes inline by clicking on the project's void.
There's also a search landing page for bookmarking purposes at: http://hwknd.com/search
Searching is word separated OR, and also indexes readmes and language names.
And a Language Wars chart (total lines of code this week): http://hwknd.com/languagewars
Also, if you sit on the home page, it will automatically inform you for any changes and display a (!) in the title, and then auto-refresh on window/tab focus.
It is written in node.js and runs completely stand-alone, with only a few modules dependencies (no extra processes).
Source code is at: http://github.com/stagas/hwknd.com (might be a bit behind in features) and is MIT licenced so you can fork it or clone it and run your own version.
I apologize for double posting this earlier this week, but there have been so many additions and features since then (it was just a blank page back then, all of the above was missing) that I felt I should repost: http://apps.ycombinator.com/item?id=1955488
Feedback and suggestions are welcome.