A new version of Soundplant has come out!
Soundplant is a program that maps recorded sounds to keys on your alphanumerical keyboard - an awesome companion for a Makey Makey in performance projects.
You can select your own sound files and map them to keys, or use any of the cool sound packets available at soundplant.org; like the sound effects from Tron, University of Iowa Electronic Music Studios Musical Instrument Samples, or car key sounds.
Checkout Soundplant's downloads page to download the program and sound packets.
Soundplant 43 is free for personal use, with a license you can buy for commercial use that comes with expanded features.