Here ya go :)
Bonk's Adventure (Gameboy)
http://www.megaupload.com/?d=GT9YV0IB

Bonk's Adventure (NES)
http://www.megaupload.com/?d=HACKBKF0

Bonk's Adventure (PS2/GC)
http://www.megaupload.com/?d=DJD0BVKG

Yeah! This Rocks!
Megaupload says the files are temporarily unavailable, though... so I have to wait! The excitement is too much! Ha, but I"ll live.

Can we still expect Bonk's Revenge and Bonk III?? =D

Looks like the links are working, I just tried the NES one. And yes, I'll be doing Bonk's Revenge & Bonk 3(both versions). I'll also be doing Bonk 2 & 3 for Gameboy(though, the 3rd one, is really a mini games type game, & didn't come out here), & Super Bonk. I think I have the music for Super Bonk 2 somewhere as well. The only one I can't get the music from, is the arcade one:(

Was there any music in Bonk's Return?

I don't think there is. I know there's not in my version, but I have the lowest version possible, because my phone ain't the hottest thing in town. But, I should mention that Hudson has alluded to there being more in store for Bonk, as in, games on multiple platforms. But, I haven't seen anything officially announced yet.