The Sarcasm Z80 Assembler is the sweetest assembler in existance, for every CPU, even those which it doesn't support (which is almost all of them).
I once created some music. Ninety Seconds is better than anything you've written, and Life with Television... Well, it could be worse. I kind of like it. If only there weren't better music to listen to.
I also wrote a little something to demodulate Caller ID signals which, surprisingly, is a problem that doesn't seem to have a well-documented solution. It makes me rather happy that I was able to come up with one.
I also created some nice instructions about replacing the control knob of an Alesis Micron. I later decided that the Alesis Micron is a piece of shit and so I didn't want to mention it on my web site, but eventually my desire to help out others who've been fucked by Alesis caused me to repost the instructions anyway. Hooray for well-documented solutions to major design flaws!
...and just in case you really have nothing better to do, there's whatever this is an excuse for. It may be an excuse for a blog, but I'm not really sure.