Justin King is one of the tappers, slappers and percussive players that catch a lot of player's ears. Seems like you either like that style or you can't take it for very long. I find it interesting and depending on the player, it can be very cool. You might look into Candyrat Records. A good many of those players do the same kind of stuff and sell transcriptions of their tunes. Don Ross and Andy McKee will blow your socks off.
http://www.candyrat.com/Tabs.aspx
Preston Reed is another player who has music out. He started as a Leo Kottke clone in the 1970's and later shifted and took tapping and percussive playing to a whole new area. Michael Hedges was one that started it all and his music is out. Google these guys and you'll find their stuff. I can't recall any specific instructional material on the style but I'd start at Candyrat and follow the links.
It's not an easy place to start, on guitar. But if that's the sound that does it for you, why spend time learning something else.
Have fun!