Some good resources for bluegrass music tablature include BluegrassGuitar.com, GuitarNick.com and BluegrassBanjo.com. Bluegrass Guitar provides tabs for lead and rhythm guitar, as well as informative articles on learning to play, crosspicking, types of guitars, buying tips and other gear.
Guitar Nick offers plenty of bluegrass and Irish folk song tablature, as well as lessons on playing fingerstyle, flatpicking, electric guitar, tuning and chords.
Bluegrass Banjo is a banjo-centered website offering banjo-related tablature, sound and midi files, history, trivia and tunings. It also offers festival and tour dates, cartoons and clip art, newsletters, beginner banjo lessons and software for banjo pickers.