http://www.youtube.com/watch?v=0NetKCTVFEA&feature=relatedOn Edit: I've worn out three vinyl copies of "The Lamb". The only tribute band with endorsement from all current and former members of Genesis is called "Musical Box". I've seen them twice - "Selling England" and "The Lamb", the latter of which included all of the original black & white slides used for the three-screen display behind the band. They do everything with vintage equipment (although I did notice a small computer monitor by the keyboards at the "Lamb" concert). They use full costumes and props, as close to the original as possible, and have had assistance from the original members in the theatrical aspects. They mostly tour in Europe and are widely popular there.
http://themusicalbox.net/ - they'll be state-side through early Dec (ending in Canada) and they're doing "The Lamb" again.