Just finished watching the third video of Scott Devine's Groove Formula series, which you can find [url="http://www.thegrooveformula.com"]here[/url].
I have to say it's a very useful and usable approach to building a groove from the ground up. He has tried to help non-music-readers with his 'Groove Grid', basically a 4/4 bar broken down into 1/4-, 1/8-, and 1/16-notes, so prepare to do a lot of 1-e-&-a counting!
Heartily recommended.