Where's the soundtrack? Or other extras? I love all the extras GoG throws in, so when I saw that psychonauts was being added here, I rushed straight away to see what extras there are, and I would have totally bought this game a second time had there been a soundtrack. Still it is good that this game gets out to those who haven't played it, so thank you for that GoG.

Yeah, I already have the game on Steam, and I probably would have bought it here today if there were more extras. :(

I bought it on steam and later on XBox Live Arcade. I really don't need to buy this a third time regardless of extrass and stuff. It's an awesome game though and I recomend it to everyone.
It's in my top list of games, but actually my second less favorite Tim Schafer game (my least favorite game sadly being Brütal Legend).

I, too, was hoping for the soundtrack as an extra. That's one of the main reasons I've held off buying the game somewhere other than GOG.
If I buy it now will I still be able to get other extras if they're added to GOG later?

Yes.
Some games have had extras added since they were released and they are made available for everybody who has purchased the game.
If some extras are added later on to this game, they'll be available for download along with all the other files related to the game from your 'My account' page.

The Psychonauts soundtrack is currently being sold as MP3 downloads on Amazon - as two separate titles no less: Psychonauts Original Soundtrack, Psychonauts Original Cinematic Score. My guess is that the publisher doesn't want to ruin soundtrack sales by offering it free with the game.

Yeah, i bought the soundtrack CD back when i bought the game directly from Double Fine, doubt theyll add the soundtrack as extras when its still being sold.
On the other hand, they COULD add the DVD with all the cutscenes, that Double Fine offered as an extra for a few months on their site, i happened to luck out and get it :).

Since this got bumped anyways, is the soundtrack any good? Or, is the soundtrack worth monies?

I bought the soundtrack on Amazon, and I didn't regret it (I bought the "Soundtrack" one, not the "Score" one. Soundtrack seems to be the level background music mostly, while the Score is the cutscene music.) It's a nice album if you like quirky, atmospheric songs.