Those Generous guys at Trash Audio -  Justin and Surachai have just released a Free TR-808 Sample Pack. Did I mention it is free.

Their website http://trashaudio.blogspot.com/2010/01/roland-tr-808-sample-pack.html  has a statement from Surachi that states :- 

"Justin graciously let me borrow his Roland TR-808 and when trying to program some patterns I noticed a few problems.
        * A) I’m clearly too stupid to work this machine – I eventually figured it out but off the bat, both the Pattern knob the Auto Fill In knob were double teaming my brain and left me staring at shifting patterns that mocked me with changing tempos.
        * B) The sequencing buttons themselves have been accumulating grime over the years which makes it difficult to activate a note. I would gladly take this thing apart and clean it but it’s not mine.
        * C) It’s outdated. While the interface is preferred for many people, I’d rather do this on a computer or something more flexible like a Machinedrum.

    Long story short, I decided to sample it and save people the hassle of finding/buying one. Oh yeah and it’s free."

I have just downloaded this - thanks very much guys.