They aren't new but 10ft Ganja Plant and Fat Freddy's Drop have been getting a lot of play time on my iPod

Jim, I think you're in for a surprise. Few current reggae artists play the roots variety that Marley played. Most has evolved into a rap/dance hall style, heavy on keyboards and stuff. The traditionalists - like in blues - are mostly whites, who are into the ethnography of the whole thing.

That said, you can lookup old stuff, like Desmond Dekker, Jimmy Cliff, and Toots and the Maytals. Some newer - but not new - reggae includes Black Uhuru and Pato Banton, both of which are excellent. Don't dismiss Marley to your college frat brothers, either. Lots of his best stuff isn't on "Legend." Go to his really early stuff (pre-reggae ska and rock steady), up to about "Catch a Fire," and check out "Uprising" and "Kaya" for great later stuff.

Better yet, I'll make you a mix to get you started.