For the music, there is also a Divine Divinity Music Extractor (72KB) by BrainBox, to extract the soundtrack from the installed game files (in ogg format).

DD music


Both the music and sound effects are located in the '..\Divine Divinity\Run\dat\sound.cmp' file; presumably environmental sounds like the tavern background noise would also be included. The music is in Ogg format and starts with the text string 'OggS', while the sound effects are in wave format, and start with 'RIFF' then a couple other characters, followed by 'WAVE'.
AFAIK nobody has made a sound effects extractor, so you would have to manually save each wav section (from each 'RIFF' term to 'Sound Forge 4.5 ' [note the zero byte at the end], just before the next 'RIFF' term) until you found the right one.
There should be a way to automate this... I'll see if I can find something to process binary files.