I went and finished off Baldur's Gate, including all of the Tales of the Sword Coast content. There is some very challenging content in there, moreso than with the base game. The Greater Wolfwere, the Demon Knight, and Aec'Letec were all very tricky fights, and each more difficult than the final story confrontation with Sarevok.
I've had a blast with Baldur's Gate, and am definitely looking forward to more not only with the sequel, but the additional content in the Enhanced Editions as well as the upcoming Icewind Dale Enhanced Edition and numerous other D&D computer RPGs I already own.
For now, though, I'm going to play a number of things, starting with Legend of Grimrock II. It looks to be a refined, expanded, and enhanced sequel to the excellent first Grimrock, and I'm excited to delve in. So far I've created a group and explored a little of the beach you are washed up on after being shipwrecked.