My list as of 10/17/07:

1776 Original Motion Picture Soundtrack

Altar Boyz
    *OCR
    *Original Off-Broadway Cast 06/14/05 -- nice audio quality, bit too much bass

Company OCR

Der Glockner Von Notre Dame OCR

Disney Demo/Cut Songs

Evil Dead the Musical OOBC

The Fantasticks OOBC

Frankenstein, the Musical Concept Album

God Bless You, Mr. Rosewater demo - all songs sung by Howard Ashman & Alan Menken

Hairspray Original Motion Picture Cast

Into the Woods OBC

Into the Woods
    * Demo recording w/OBC - 10 tracks

Joseph and the Amazing Technicolor Dreamcoat concept recording (one long file)

The Little Mermaid
    * Broadway Workshop (including Part of Your World).  Ariel - Kerry Butler, Prince Eric - Stephen R. Buntrock, Ursula - Emily Skinner, Scuttle - Buddy Hacket, King Triton - Jeff McCarthy

Little Shop of Horrors - 09/01/04 tour cast, Seymour - Anthony Rapp

Little Shop of Horrors demo - Ashman/Menken singing all songs

A New Brain OCR

Newsies Original Motion Picture Soundtrack

O Corcunda de Notre Dame (Brazillian "Hunchback of Notre Dame") Original Motion Picture Soundtrack

Part of Your World: The Music of Alan Menken - Recorded live in New York, September 26, 2005

Pocahontas Original Motion Picture Soundrack

Rent
    * OCR
    * Composer Demo; Professional Demo recording with Jonathan Larson and unknown cast. Includes many elements which were dropped even before the NYTW production, such as "Because You Were Right" between Mark and Maureen and the lengthy "Valentine's Day" sequence. Also includes many of the same cut songs used at the NYTW, such as "Splatter", "Do a Little Business" (and its reprise), "Right Brain", and "Open Road". The last snips of Act One are missing.
    * NY Theater Workshop production, Mark - Anthony Rapp, Roger - Tony Hoylen. Mimi - Daphne Rubin-Vega, Maureen - Sarah Knowlton, Joanne - Shelly Dickinson, Collins - Pat Briggs, Angel - Mark Setlock, Benny - Michael Potts, Ensemble: Erin Hill, Deidre Boddie-Henderson, Gilles Chiasson, Sheila Kay Davis, John Lathan, Jesse Sinclear Renat

A Shoggoth on the Roof - the HPLHS Cast Album

Silence! The Musical composer demo

Smile: the Musical
      * Carolyn Leigh Demo featuring Marvin Hamlisch singing all the roles - mostly different songs from the final version, very different concept for the same story
      * Ashman & Hamlisch Demo featuring Howard Ashman and Marvin Hamlisch singing all the roles
    * November 22, 1986 - Final Broadway Preview; Contestants: Robin Gibson, Antelope Valley...Anne Marie Bobby, Doria Hudson, Yuba City...Jodi Benson, Sandra Kay MacAffee, Bakersfield... Veanne Cox, Maria Gonzales, Salinas...Cheryl-Ann Rossi, Shawn Christianson, La Jolla...Tia Riebling, Valerie Sherman, Sacramento...Lauren Goler, Heidi Anderson, Anaheim...Deanna D. Wells, Patti-Lynn Bird, El Centro... Mana Allen, Debralee Davis, Eureka... Andrea Leigh-Smith, Kate Gardner, Fresno... Mia Malm, Linda Lee, San Francisco... Valerie Lau-Kee, Kimberly Lyons, Palo Alto... Julie Tussey, Gina Minelli, San Luis Obispo... Donna Marie Elio, Dana Simpson, Sausalito... Renee Veneziale, Connie-Sue Whipple, Visalia... Cindy Oakes, Cookie Wilson, Carson... Nikki Rene, ...and last year's winner, Joanne Marshall...Mia Malm; Adults: Brenda DiCarlo Freelander...Marsha Waterbury, Big Bob Freelander...Jeff McCarthy, Tommy French, the pageant choreographer...Michael O'Gorman, Dale Wilson-Shears, chairman of the Young American Miss Foundation...Richard Woods, Ted Farley, an Emcee...Dick Patterson, Carol, Brenda's assistant...Ruth Williamson, Tony, a volunteer... Jeffrey Wilkins, Robin's Mom/Judge/Volunteer... Laura Gardner, Photographer/Judge/Volunteer... K.C. Wilson; Kids: Little Bob Freelander... Tommy Daggett, Freddy...Andrew Cassese
    * Unknown Date (sometime in 1986), Original Broadway Cast
    * Samuel French cast recording with most of the OBC and Howard Ashman singing some of the male roles.  Synthesizer audio.  Very high quality cd-rip, Apple AAC format

Spiderman the Musical concept recording

Spring Awakening
    *April 11, 2007; OBC except for Krysta Rodriguez as Wendla

Stavisky Original Motion Picture Soundtrack (composed by Stephen Sondheim)

Summer of '42 demo

Sunday in the Park With George OCR

Sweeney Todd Backers Audition
    *Hal Prince provides linking narration and Stephen Sondheim plays the piano and sings all songs, recorded live in 1978

tick, tick...BOOM!
    * London cast, July 1, 2005; Jonathan - Neil Patrick Harris, Michael - Tee Jaye, Susan - Cassidy Janson

Violet: 1988 OOBC

Weird Romance OOBC

The Wizard of Oz in Concert

Wicked San Fransisco workshop
    * Preview recording with Original Broadway Cast and someone (Stephen Schwartz, possibly?) providing "linking narration." Very high audio quality, Apple AAC format

Young Frankenstein World Premiere
    *Recorded on August 7th, 2007 at the Paramount Theatre, Seattle, WA.  Starring (in order of appearance): Herald - Paul Castree, Ziggy - Jim Borstelmann, Inspector Kemp - Fred Applegate, Medical Students - Justin Patterson, Matthew LaBanca, Kevin Ligon, Frederick Frankenstein - Roger Bart, Mr. Hilltop - Jack Doyle, Telegraph Boy - Brian Shepard, Elizabeth - Megan Mullally, Shoeshine Man - Jim Borstelmann, Igor - Christopher Fitzgerald, Lawrence - Jim Borstelmann, Inga - Sutton Foster, Frau Blucher - Andrea Martin, Victor - Jack Doyle, The Monster - Shuler Hensley, Transylvania Quartet - Paul Castree, Jack Doyle, Kevin Ligon, Brian Shepard, Hermit - Fred Applegate, Sasha - Eric Jackson, Masha - Heather Ayers, Basha - Christina Maire Norrup, Tasha - Linda Mugleston, Bob - Paul Castree, Ritz Specialty - Eric Jackson, The Count - Matthew LaBanca