This is the tutorial I used by Ga.Medic etal. Easy to follow cooking instructions. Read until you feel comfortable doing it.
http://forum.ppcgeeks.com/showthread...light=gguruusa
As far as "worth it", I am happy with it and I don't notice any speed difference faster or slower. But the things you can do natively, e.g. html mail, can be done with other software. You do lose Pocket MSN if that is important to you but you gain Windows Live. The upgrade is WM6 Pro so you get the better Office applications. I cooked MS Voice Command 1.5 which is fun. Dunno, what's one man's trash is another's treasure.