Uplink
One of the great wastes of time in the world. Uplink is a Hollywood-style hacking simulation game, complete with slot machine password breakers and bank accounts with lots of cash. Despite the humongous number of inconsistencies you can pop up with in the game, it's quite nice. It also makes for a good "How excessive can we be this run" game, and there's nothing quite like reaching Rank 1 on the Agents list in 2 ingame days (personal record, as of before this post).
Anyone else lose their best agent to a passive trace from a LAN?