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
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

VNC is great at saving me getting up and walking around physically to each one