Here's my list of Ringtones, etc There are about 440 in this zip.
1. I have named all the files shorter than 10 seconds with a prefix of "Alert-"
2. I have renamed all the files from 10 to 30 seconds with a prefix of "Ring-"
3. I have renamed all the files longer than 30 seconds with a prefix of "Alarm-" in hope that people will start waking themselves gently with a ramp up time on their alarm tones. (I may add some files that actually ramp up in volume for the cheapskates who won't spend a buck on a ramping alarm app. I may not. I know how tough it is to have to scrimp a dollar, but I also realize developers work their hineys off for peanuts. If you can support a developer, do, so that those who genuinely can't, like some independent developers, can still have access to decent free apps.)
Not all of the files with "Alert-" on them were intended to be notifications. Many of them were intended to be ringtones. My naming convention is determined by temporal length exclusively, except for a couple of 9-second files. Please feel free to use "Alert-" files as ringtones, as they genereally have a file size of less than 50kb and can be accessed quickly when your phone starts the incoming call process. I used the word "Alert" since it struck me as generic, but still helps define how long the sound file is.
I have converted these to ogg-vorbis format since the Xda-Developers' forum around reducing time before Android phones ring determined ogg was the fastest. I did it with the Windows app "Audacity." If you want to add effects, convert to and from a few widely-used formats, or otherwise manipulate sound files, I strongly recommend this free download: AUDACITY
Most of these are readily available online. A few of them I wrote. Some of them I downloaded and doctored up. My apologies to the authors/composers/developers if I butchered them. If you want credit, please, please alert me. The only reason I didn't give credit is that I didn't know where to put it. OK, yes, I have to apologize to HTC. They are just consistently good in the sound and graphics departments.
EDIT (15 Mar, Mon): I Edited the Metadata so it includes the prefixes. When you're using Rings Extended now, all of the alerts will be together, and all of the rings will be together. If it didn't have Metadata, I left it out so that it'll use the file name. Sorry about that.