4 PCs, 4 laptops in this house (one PC, one laptop is mine). These include a P2 450 MHz, Athlon Thunderbird 1.2 GHz, Athlon Thunderbird 1.33 GHz, Athlon XP 1.53 GHz, Pentium M 1.3 GHz, P3 1.2 GHz, AMD Athlon XP 2 Ghz, and P4M 2 GHz. Excluding my PC, there's about 1 TB of disk space between the other 7. My PC itself has 1.1 TB :D
Over the past few weeks though, I've been using between 3 and 5 of these on my own simultaneously due to the amount of processing power the work I'm doing requires :p VNC is great at saving me getting up and walking around physically to each one :p