I just uploaded these from my collection, a must for any big Captain Beefheart fan! (also relatively difficult to find these, even on soulseek; never seen 'em on blogs or anything):
http://www.mediafire.com/?ztjnnimjtit
CAPTAIN BEEFHEART - LANGDON WINNER'S 1972 REHERSAL TAPE (44mb)
This is sometimes called "Lick Me Decals Outtakes" tape but that version of the tape is missing some of these and has worse sound quality. This has never been officially released. Features instrumentals that have never been released, as well as 2 early versions of "Semi Multicolored Caucasian" (which didn't get recorded until 10 years later!) and a crazy version of "Best Batch Yet". Sound quality is decent, overall; as good as a direct-to-tape-recorder recording can get, and there's some speeches in between... fascinating stuff.
http://www.mediafire.com/?k0lt3ttywqm
CAPTAIN BEEFHEART - DON'S 1969 PIANO WORKTAPE (17mb)
This is a short but interesting little recording right before Trout Mask was recorded, of Don playing some of the songs (and some unreleased stuff) on piano. Would love to hear a full tape worth of this stuff, since this is so short. Also has some great moments of Don whistling.
http://www.mediafire.com/?wjnw1zyzzzm
DON VAN VLIET - RIDING SOME KIND OF UNUSUAL SKULL SLEIGH (70mb)
This one was part of a super limited book/etching/hand drawing/DVD (the DVD is Anton Corbin's experimental film about Don, "Some Kind of Yo-Yo Stuff" or whatever, which you can watch part of on youtube) set. It's a spoken word of a lot of the Captain's poems and as far as I can know it's the last available document of the Don in any capacity except for a few paintings since then. The set is completely sold out of course and it carried something like a $1500 price. All the spoken pieces are from poems from the Beefheart days except for the last one, which was written around the time this was recorded (10 years ago). The Captain sounds old and sick but these are still some amazing readings of some crazy poems. Fascinating stuff... Also included is a picture of the self-portrait of the Captain, the only self-portrait he has ever made, which was the main reason to buy this set.
http://www.mediafire.com/?mzyqlzenzwd
DON VAN VLIET - STAND UP TO BE DISCONTINUED (14mb)
This was from another ultra rare book set. I'm not sure of the info on it, but it was some limited thing with a book that had prints of his paintings. Obviously sold out and if I remember correctly it went for like $500. This CD came with it, and it has a few poems of unknown origin (probably were new when they were recorded, back in 1994) but then it has a few old Captain Beefheart songs, like Fallin' Ditch and Skeleton Makes Good. All spoken in the Captain's gravely, old voice.
Also, as a bonus...
http://www.mediafire.com/?xyqljd2m3k5
165 of DON VAN VLIET'S PAINTINGS (8mb)
This represents a small collection of his paintings/drawings. Amazing stuff.