You can just rename in Astro and it will convert to ogg. I just tested it to see if the file will still work (mine used to be a wma file).
There are a few UI sounds that I've been wanting to mess with, so looks like it's the perfect time for me to sit down and root both of my phones.
Anybody have some good step-by-step tutorials on how to backup the OEM ROM, as well as a step-by-step for "unrooting"? I'm already familiar with the step-by-step on how to root, but I want to be sure I know how to revert the device, if I ever need to.