Almost forgot to mention: RTD wrote in his last memoir that Benny and Bjorn from ABBA are big TW fans and wanted to write a musical based on the show! Don't know if it's ever gonna get off the ground. TW Mag mentioned a small theater group in the UK that was putting together a TW musical.

PS: David Tennant wanted to do a all-musical episode of Dr. Who (a la Buffy)!