Ahh Red Alert.. good times. Also Doom, Diablo 1, Total Annihilation (never liked SC1)
Other random bits:
- "noob" was spelled "newb"
- pirating music/games/porn through irc/ftp sites and hoping you didn't get a virus
- downloading midi music files because mp3 took too long on a 14.4 modem
- getting disconnected whenever someone would call your landline
- Doom sprite packs to make enemies look like bunnies/cartoons/etc