.deb is the "package" format for Debian. It's analogous to a .zip file. Sortof. You can uncompress it with the "dpkg-deb" command that does come with the Debian distribution.
I could also uncompress it for you and send it to you as a tar.gz file.
Also, if it's part of the stock Debian distribution, you can download elements from inside of packages from their website (the packages section) at www.debian.org. If it's just somebody else's work, they won't have it.
But, some other thoughts... The ia1 isn't intel-based... it doesn't have MMX. I'm not familiar with what you've mentioned, but a quick search on Google for "the MMX mp3 player" didn't get me anywhere.
Also, I'm afraid that the midori that we're all using right now doesn't do java. Some folks are working on it, I think.
There might be a screensaver program that is an alarm clock. Look up xscreensaver and see what you get.