http://www.pagetable.com/ - Assembly related trivia and puzzles. Fun!
Russ Allbery(Eagle) Has a task app (cgi, python) I haven't tried yet, but at 0.2 has more features then my lame web.py app. Also fun quotes from Tolkien and Murphy, oss software (he is a debian package maintainer), usenet and mailing list nettiquite.
Nicolas Rougier A lot of mathematical+gui+opengl applets in python/c++. Written by an "Experienced Research Scientist". Including glpython which combines ipython and opengl, and pylab gtk console.