Teething troubles with remote (fixed now) but other than that painless install.
1.5GHz
512Mb RAM
80Gb Seagate Barracuda HDD
Soudblaster Audigy 4 (turn off on-board sound in BIOS before installing knoppmyth)
WinTV Nova-T PCI card with Hauppage silver remote
NVidia Geforce 5200 256MD video card
Thanks to everyone's hard work on this - I'd tried to install MythTv on ubuntu previously and failed miserably.