Yep, it's 3.5. The changes between 3.0 and 3.5 aren't major, but you should make your character using the SRD for the sake of class, race, and weapons. Skills are mostly unchanged, with a few minor additions, and there are new feats that you're free to use. Non-standard races are allowed, with a maximum ECL of 4, as long as they're suitable for the setting. Currently, the Yellow team is short on players, so an Underdark native, evil or neutral, most likely, would be the best. Once your character is put together, send a sheet to both Mr. President and me for approval.