What hardware / distro are you using ?
With the idea to help new users, maybe it could be usefull for them to have some feedback around distro and hardware (motherboards, displays, input etc) to chose or avoid and of course in case you recommand to avoid, explain why, which were the encoutered difficulties and how you did to workaround the trouble.
My config
hardware : VIA Epia M10000, 256 Mb, 40 GB Disk, touch screen e-galax, Navilock gps receiver, Navigator 4, 4 x 200W Blaupunkt amplifier, Motorola Razr V3 for it's gprs modem and bluetooth services, Home made fast 10 channels A/D converter card, Home made 16 channels A/D I/O card, cambridge bluetooth usb adapter.
software : Distro LFS mainly based on kernel vanilia 2.6, portions of Mandrake 10, portions of FC4, Xorg, some portions of Xfree86, Windowmaker and home made front end.