The BiG World Project aims to merge all games of the Baldur's Gate series and the additional contents created by its community in one massive adventure, including a modification of BG1 to run BG1 with the more modern engine of BG2, plus the added functionality of ToB expansion. Now all new functions which are introduced only with BG2 are also available for BG1. This signifies, BG1 uses just like BG2 the same graphic arts, the same character kits, the same magic and the same rules. Now even for those which know BG1 by heart this is a new play experience. Besides, it also includes an additional transition from BG1 to BG2
http://www.shsforums.net/topic/44661-big-world-project-bwp-v90/
Haven't tried it yet but could be useful for BG players





