Easy, just visit THG's mobo guide... You should focus on which CPU/mobo combo you are interesting. If Intel you should study i845 series, i850 series, E7502, SiS645, SiS648, SiS650, SiS655 chipset. If AMD you should study KT333, KT400, nForce, nForce2 chipset. You should familiar with northbridge, southbridge, ram module, multiplier, jumper setting, BIOS etc. with both Intel and AMD chipset.
My PC has gone to hell... because it's a killing machine...