I know Roo is usually a jamband thing but they seem to be changing. Here is the first list of bands.
Radiohead 
Tom Petty & the Heartbreakers 
Phil Lesh & Friends
Beck 
Elvis Costello & the Imposters 
Bonnie Raitt 
Death Cab for Cutie 
moe. 
Bright Eyes 
The Neville Brothers 
Bela Fleck & the Flecktones 
Buddy Guy 
Damian Marley 
Ben Folds 
Robert Randolph & the Family Band 
Dr. John 
Matisyahu 
G. Love & Special Sauce 
My Morning Jacket 
Ricky Skaggs & Kentucky Thunder 
Steel Pulse 
Mike Gordon and Ramble Dove 
Cat Power 
Medeski Martin & Wood 
Nickel Creek 
Gomez 
Atmosphere 
Steve Earle 
Blues Traveler 
Amadou & Mariam 
Stephen Malkmus & the Jicks 
Dresden Dolls 
Son Volt 
Clap Your Hands Say Yeah 
Jerry Douglas 
Soulive 
Rusted Root 
Devendra Banhart Band 
Donavon Frankenreiter 
Mike Doughty 
Sasha 
Grace Potter & the Nocturnals 
The Magic Numbers 
Bill Frisell 
Seu Jorge 
Bettye LaVette 
Dungen 
Shooter Jennings 
Rebirth Brass Band 
Robinella 
Andrew Bird 
Steel Train 
Jackie Greene 
Devotchka 
The Wood Brothers 
dios (malos) 
Toubab Krewe 
The Motet 
Marah 
I-Nine 
Balkan Beat Box 
The Cat Empire 
If you thinking about going but aren't sure if the festival scene is for you head over to the Inforoo boards their good people and will help you out.
http://bonnaroo.proboards21.comAnyone going or have been?