KiPhish: Posted while typing my own post haha. How different are the rulesets in Nwn as compared to BG? Right now, I mostly want to get the 3rd edition ruleset down completely. As much as I want to play BG down the road, I'm kind of hesitant to learn a new d&d ruleset when I barely understand the 3rd one.
I'm not really an expert since I've always been more interested in the stories than the stats and can't claim I fully learned and understood any edition's ruleset. I managed to beat the games and have fun with them, and I didn't care for the rest. From what I know, some things that changed from 2rd to 3rd edition are:
1) The armor class: Prior to 3rd edition, a low armor class was better protection. It started at AC 10 (easy to hit) and from there went down to 0 and then -10 (very hard to hit) or even beyond. There was also something called THAC0 which was a stat to calculate your chances of hitting someone with AC 0, but I won't try to explain it to you.
2) The feats: They have been introduced with the 3rd edition, there were no feats in 2nd ed.
3) Some race/class options, e.g. there were no sorcerers in 2nd edition and your choice of class was dependent on your race, e.g. halflings were not able to become wizards, IIRC, humans could not multi-class (they could learn more than one class but not in the same easy way as other races), and if I'm not mistaken some races even had level caps on some classes and could not learn anything new beyond a specific level, so that humans would always surpass them.
EDIT: Whoops, PenutBrittle was faster. :)