Random sample of topics.. you get the flavor:

• vcslog - Logs interactions with version control systems (https://github.com/wolever/vcslog)
• Pssst! Want to stream your videos to your iPod? (http://stevehanov.ca/blog/index.php?id=102) 
• VimGolf (http://vimgolf.com/) and HandlerSocket (http://www.igvita.com/2011/01/14/handlersocket-the-nosql-mysql-ruby/)
• Gaseous (https://github.com/brentlintner) 

• Dave Vandervies - Parallel programming with continuation soup.

  My basic idea is that by writing everything in continuation-passing style

  and adding parallel fork and join combinators, it should be possible to

  write code that exposes useful amounts of parallelism to the runtime

  system, without having to reverse-engineer it from the sequentially

  written and compiled code that most languages assume.

  My code:  git://int-main.ath.cx/~dj3vande/ksoup.git

• Chris Liscio - SMUGMath

  http://bitbucket.org/liscio/smugmath

  http://www.supermegaultragroovy.com/blog/2009/11/20/math-and-cocoa/

  http://www.supermegaultragroovy.com/blog/2009/11/24/announcing-smugmath/

• Ryan - Pivotal Stickies

  Preview of an app that lets you print out Pivotal Tracker stories and tasks onto paper stickies for use on a scrum wall, etc.

• Dan Silivestru - jsUnityRunner

  We've created a JavaScript test runner for testing asynchronous JavaScript tests. It is based on the jsUnity testing framework. We have an open gitHub repository for it and that repo includes sample test code. Our framework allows you to group your tests into test suites and it also allows for the use of just one html file to contain your DOM elements. You can load those elements dynamically when you need them. We welcome feedback from the community and any and all contributions are welcome :-)

  The repo can be found here: http://github.com/tinyhippos/jsUnityRunner

• Chris Liscio - A peek into the future of Capo and OpenCL performance 

  http://supermegaultragroovy.com/products/Capo/

• Stephen Weber - Reverse Polish Notation for Ruby

  http://github.com/singpolyma/RPNR

• Ben Morris - HexBug

  Javascript + App Engine + XMPP + Arduino = Awesome HexBug

  http://github.com/bnmrrs/HexBugNc

• Joey Robert - Fiasco Chess Engine

  Fiasco is an open source, pre-alpha chess engine written in C# and .NET. It features a "classic" alpha/beta brute force search, quiescence search, move ordering, an opening book, and XBoard/Winboard support. It's based on a 10 x 12 board representation.

  http://github.com/joeyrobert/fiasco

• Andrew Kalek - Mongify

  A data translator from sql database to mongoDB.  http://github.com/anlek/mongify