Jah provides
Essential Record Labels
http://www.trojanrecords.net/
http://www.bloodandfire.co.uk/
http://www.heartbeatreggae.com/
General Info
http://www.reggae.com/ (the name makes this a decent place to start)
http://en.wikipedia.org/wiki/Reggae (I LOVE Wikipedia!!)
http://www.reggaenews.co.uk/ (Jamaica was an English colony until 1962 so there are a lot of Jamaican transplants living in the UK. Ska was also popular in the 60's with the white kids known as mods)
http://www.roots-archives.com/ (mainly discographies)
Any of these 4-disc Box Sets would give you a good introduction to the whole of Jamaican music. I'd be happy to make more specific recomendations if anyone asks. Just let me know what style you like.
This Is Reggae Music
Tougher Than Tough: Story Of Jamaican Music
The Reggae Box
You can look these up on Amazon or whatever along with...
VERY HIGHLY Recommended Books
Reggae: The Rough Guide (companion to the Tougher Than Tough box set)
This Is Reggae Music: The Story of Reggae Music (ironically, this has nothing to do with the box sets listed above)
Recommended Films
Harder They Come-
http://www.imdb.com/title/tt0070155/
Stars Jimmy Cliff in an homage to real life criminal and Jamaican folk hero named Rhygin (Cliff plays similarly named Ivan)
Rockers-
http://www.imdb.com/title/tt0079815/
Featuring a cast of all-star musicians including drummer Leroy 'Horsemouth' Wallace. The band in the scenes at the country club is Inner Circle, who later became famous for the song Bad Boys from the Cops tv show.
At this point I'd like to point out that, unlike heavy metal, your local library probably has a lot of reggae books, films and music. That's where I discovered a lot of this for free. (To be honest my library does have quite a bit of metal but it is all commercial crap

)
And finally, this is a fun flash-animation site that uses cartoon visuals allowing you to make your own dub music. Pick a theme and then explore all the mouse-over created sound-effects. High Times!
http://www.infinitewheel.com/infinite_wheel.html
Rocket, noisefan