Well, socalMAN123 gave a list of the best ska bands ever. You should look some of them up! =]
But, for right now, here is some ska.
Am I allowed to point out that these, and those on the list, are technically only third-wave ska, with the original bouncing out from rocksteady and reggae, in Jamaica in the '60s, and then second-wave being British bands like The Specials, The (English) Beat and The Selecter? =] Sorry to sound like a smart-arse. I do LOVE Reel Big Fish though, must see them when they do their annual February UK trip.
[EDIT/] apologies, having looked back there are older ska bands mentioned =D
Any Clash, Damned, Buzzcocks (etc) fans?