|I wouldn't bother connecting them together. |
You can build a fantastic retro gaming rig around a P3. Win98SE would be the best OS for running the classics, not XP or 2000.
As for the P4 box:
-File server (you may want to undervolt and underclock the CPU to save power if you plan to run it 24/7)
-Playback-only HTPC (you'll need a cheap video card with MPEG-4 and VC-1 decoding if you plan to watch 1080p content; a single-core CPU would have trouble on its own)
-You could use it to learn Linux and other software
-Torrent box (you'll need to get those Linux distros from somewhere, right? ;-)
Donate the rest of the machines or, if you're greedy like me, start a collection of spare parts.
DOS/9x Gaming Rig | Athlon 600 @ 672MHz w/ Golden Orb HSF | 384MB | 60GB
Voodoo2 SLI + GeForce 256 DDR | SB Live | Asus K7V | 21" NEC CRT | Win98SE