Well, after being away from Baldur's Gate for a few years, I came back and found the Big World Project.
I installed the Big World Project (medium version). So far I have been having a blast playing through Baldur's Gate; I am just now wondering around a collecting a party.
EDIT 1: I have decided to make one thread and report whatever oddities I encounter here.
Oddity #1: I recently noticed that in-game in the Character Record my 3rd level fighter is listed as having a base THACO of 20. When I look at the character in Near Infinity my fighter has a base THACO of 18 (which is what it should be).
My character is low enough level that I am not noticing any serious errors in how often I am hitting. Further more, I am not sure the game is treating my character as though the THACO is wrong. As I say, in Near Infinity the character record has the correct value.
I am simply mentioning it here as the Big World Project thread requests that people report In-Game Errors, and this is an In-Game Error (at least a display error and possibly a combat statistic error).
Anyway, having a blast so far and I expect I will keep having a blast. Thanks to all concerned parties: those who wrote the mods and those who made the Big World Project.