I'm sure there are posts about this somewhere on this site, but I haven't found any yet. Basically, I have a rooted D2G (no ROM) and am looking to add my own custom notifications and ringtones into the Android System, so I can just use that when choosing my sounds (instead of having to pick between Android System, and Music, let's say). So I guess I'm looking for a couple things, 1) the method of copying music files (ogg's or mp3's) into the same directory as the stock sounds in my phone's internal memory, and 2) if anyone knows of a place online with addditional notification sounds and ringtones to purchase. 2 is probably a foregone conclusion, I'm sure Google will help me out with that.
Actually was able to dig a little more after work and found the locations for file system notifications: /system/media/. Now, I just gotta find out how to push files to those folders with ADB. Back to Google.