Just found a great site called ROM Keeper. They have a full set of the latest MAME version, and ROMs can individually be downloaded. Currently they have 7096 ROMs in their database. You only have to register at http://romkeeper.com/ [Reply]
Eggman pointed me to that site a while back. Definitely useful if you only need specific games from the MAME set and don't want to try and download a complete 15GB+ MAME set or you don't have the HD space to do so. [Reply]