Not really a hack, but AOL provided some free web hosting at members.aol.com/~[your screen name]. When they increased the character count in screennames from 8

Not really a hack, but AOL provided some free web hosting at members.aol.com/~[your screen name]. When they increased the character count in screennames from 8 to 10 I immediately created some to "domain squat". My most successfully was "ikillkenny" which I used to host my mildly popular South Park screensaver website.