According to this Slashdot posting, the BBC has announced that it will be releasing new radio adaptations of Douglas Adams last three Hitchhiker's Guide to the Galaxy books. The clou is that Douglas Adams himself will provide the voice for Agrajag, a character whose reincarnations keep getting killed by Arthur Dent. Apparently, Douglas Adams always wanted to play this part and he therefore recorded it some time before his death.
Can't wait to hear this!