Grand Prix 3 has been reviewed at Gameplay's Spank! magazine, giving it a score of 98%! I think the review is biased to the game being good because they want to sell some more copies! But hey, you can get to the review here!
I have updated the downloads page with a nicer interface, and some new files I forgot to post before (or more like I ran out of time), inlcuding some new Grand Prix 3 editors and a patch to fix problems with Voodoo 2 cards. You can get to the downloads page here.