Christian Marillat from http://www.debian-multimedia.org/ notified me that he's building MP3 Diags for Debian 5.0. It can be found in the "unstable" branch. Besides the program being built by somebody who actually knows something about building, and did it many times before, there are binaries for many other platforms in addition to x86 and AMD64. You can download the i386 package from this page, but you probably want to add the repository, so you are notified automatically about new releases (see the debian-multimedia.org home page for instructions about how to add the repository.)
It would be nice for something similar to happen for other distributions, as I'd rather spend time improving the program instead of figuring out how to package it for various platforms.