I used this one pretty much since I've started at the interweb. I sometimes add variations if I sign up somewhere and it's taken. Like on youtube I have an imposter who used my screenname so I just added ftw to the end of my usual. 😛
For things I don't want to be tracked down I just put something else that comes up randomly at the time like the first 12 characters of /dev/urand. (no, not really, but would be the geeky thing to do)