I waste a lot of time fiddling with chunks of code to keep my hand in, and on occasion something useful results. Below are links to some of the more ambitious endeavors that other people might find useful as well.
Most of the code below is written in C, since I'm informed I'm officially a programming language bigot. In the end, efficiency is all that matters. C++ is a horrendous kludge that does nothing you can't do more cleanly and more efficiently in C. Despite what a lot of software engineering textbooks say, a program written in C is easier to debug, easier to port, and easier to maintain than the same program written in C++. Not to mention the fact it takes half the time to compile, less than a fifth of the disk space, and a fraction of the memory at both compile and run time. (Think I'm full of it? Take a look at what Bjarne Stroustrup, the inventor of C++, has to say about it.)
For those of you more interested in shell scripts, I need to shout out to my homie Brent Norris who seems to always be doing something interesting and outrageous with scripts on Linux. (You have to admit that using the lp print daemon for a multi-user MP3 playing queue treads the thin line between genius and insanity.)