As I know it the current grenade launcher sounds are the ones that tChr made which still isn't good enough as they sound like a fork being thrown against concrete or something, and doesn't fade away through distance. I actaully forgot that these sounds where replaced with the original ones from 2.1 and lower and Morfar reminded me about that just recently. I got really disappointed and honestly little angry as we didn't have too much say in this. There was a discussion about those sounds and as I recall it many disliked the sounds, even so much that people replaced them. I know Morfar and me playing with different sounds than those. (Me with 2.1 sounds, the original ones and Morfar with Qantourisc's). I wonder why they got included, and I'm thinking that a dev which didn't know how the players felt included them in the game too soon (or tChr nagging

). Sure there are some that like those sounds better than the original ones but I'd like a poll for that to make things clear. If people like the current ones (tChr's) sounds then I shut up, but I will never play with those myself though, they just don't fit the game IMO.
As for the sounds you can find them all here (except the current one's of course):
http://www.origionstudios.com/ai/nexuiz/old_things/sounds
To replace the current sounds, download those, unpack the .zip files in the "Nexuiz/data" directory. After you've listened and tried them out or already have an opinion please vote.
UPDATE: For some reason just having .pk3 files on on that server didn't work, whenever you tried to save it you'd just get a 4kb html file so I packed them into .zip.