3rd Edition is basically more free-form. No more "dual-classing" and "multiclassing" stuff. All characters can buy up levels in different classes is the first lesson. Be careful, though, pay attention to the "favored class" rules so you don't lose 15% XP. The IWD2 rulebook is quite good as an intro. Also, the game itself is very good about defining what is what. Right click when choosing feats to know what they do. Not everything follows 3Ed. rules -- for instance I noticed today that "improved initiative" in IWD2 only benefits spellcasters.
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