For those interested, in running BG1/2:
BG2 Fix Pack - Fixed a number of bugs and text/grammatical errors (English text only).
Ascension - A collection of changes to Throne of Bhaal, aimed at providing a richer story and more tactically interesting gameplay.
BG1 Unfinished Business - Restores cut content and quests from BG1 and TotSC.
BG2 Unfinished Business - Restores cut content and quests from BG2.
BG2 Tweaks - Graphical and animation tweaks, adds/adjusts a number of things, including rules changes and companions (these are asked on an individual basis during installation, since it also includes various cheats as well for those so inclined).
Font Mod - Adjusts the font size (very useful for modern resolutions).
BG Trilogy - Combines BG1, TotSC, BG2 into one seamless game. Is a mod installed on BG2; therefore, the story of BG/TotSC can be experienced with the updated graphics, better resolution, and interface improvements present in BG2, including class/race options not available in BG1.
* Note: I do not know if these have been updated to work on the EE games; with the above mods I've never needed to play the EE versions. I would guess that the Font Mod is not needed for the EEs.