Use the search button I've post HUGE lists many, many times. Lots of great threads on this already with tons of info.
Slightly Stoopid Pepper The Supervillains (More ska than reggae) Passafire The Expendables Diego Roots Dirty Heads P-Nuckle Ooklah The Moc Underwater And of course pretty much the whole Marley family. Hope that helps!
Peter Tosh is my favorite. Check out Milele Roots if you get a chance, they are a local reggae band that are amazing. Their bassist was a substitute teacher at the high school I went to until he got caught with weed.
check out the low life... [ame="http://www.youtube.com/watch?v=JR83LB5dAOc"]YouTube - The Low Life - You are everything[/ame] is a good start.