Here you go:
THE MUPPET MOVIE
-Jim Frawley's Camera Test
-Muppetisms (just so you know, these are less than a minute clips of certain muppets saying stuff)
-Bonus Trailers
-Interactive Menus
-Scene Selection
THE GREAT MUPPET CAPER
-Muppetisms
-Bonus Trailers
-Interactive Menus
-Scene Selection
THE MUPPETS TAKE MANHATTAN
-Interview with Jim Henson
-Muppetisms
-Bonus Trailers
-Interactive Menus
-Scene Selection
THE MUPPET CHRISTMAS CAROL (coming October 8)
-unknown as of now
MUPPET TREASURE ISLAND
-Hidden Treasure Commentary with Brian Henson, Gonzo & Rizzo (with introduction by Gonzo & Rizzo)
-The Tale Of The Story Beyond The Tail featurette (hosted by Gonzo & Rizzo)
-Treasure Island Sing-Along (with introduction by Gonzo & Rizzo)
-Scene Selection
-plus most of the menus have Gonzo & Rizzo walking around and talking
MUPPETS FROM SPACE
-Live Video Commentary with Tim Hall, Gonzo, Rizzo & Kermit
-Outtakes Reel
-Music Video "Shining Star"
-Original Theatrical Trailer
-Bonus Trailers
-Talent Files
-Production Notes
KERMIT'S SWAMP YEARS (coming September 3)
-Blooper Reel
-Selected Scene Audio Commentary with Kermit and Horace D'Fly
-Behind The Scenes Featurette
-On The Set With Kermit
-Bonus Trailers
-Scene Selections
-Animated Menus
Hope I could help. I didn't know if you wanted to know Labyrinth or The Dark Crystal but just let me know if you do and I'll post those up here.