I've been hunting for months for a clip of that beloved noise we hear when we nail a grunt right in the face with a bullet to use as my text message ringtone to no avail.
As of recently, I had heard someone with the ODST audiolog clip as his text sound and I just couldn't wait anymore. I took it upon myself to creat a sound close enough to the original to use using a clip from Viva Pinata (to my understanding, the source of the children cheering) and a free-source generic "pop" sound.
You can get the clip to make into a ringtone here:
http://www.4shared.com/audio/dlxHhrxm/GBP.html
Enjoy guys! :D