I bought a TT030 on eBay last May. (http://atariage.com/forums/lofiversion/index.php/www.digitpress.com/eastereggs/t126254.html)
My intent was to get NetBSD (http://www.netbsd.org) up and running on it, which I was able to do. But I found out that the latest version that actually functioned was 1.6.1, released back in 2003. Nevertheless, I documented an install walkthrough here:
http://netbsd-ataritt.wikia.com/wiki/NetBS...the_Atari_TT030
After quite a bit of work from some very dedicated folks on the port-atari mailing list, the latest daily builds of NetBSD 4 and 5 now boot and install! Essentially this means there is once again a modern BSD operating system you can run on your Atari. I encourage you to try it out!
Here's the gist of how to do an install...
1) Backup all your stuff. It's possible to install around AHDI partitions on your drive, but really you don't want to do this.
2) Copy files from ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-daily/netbsd-5/[latest dir with an atari directory in it]/atari to a local machine. You'll need sysinst.fs.gz and the appropriate kernel (I use netbsd-ATARITT.gz).
3) Gunzip sysinst.fs.gz and netbsd-ATARITT.gz.
4) Format a 1.44mb floppy and use rawrite to write sysinst.fs to it.
5) Boot the TT030 and use loadbsd.ttp with the -b flag to load the appropriate kernel. The kernel won't fit on a floppy so you'll need to drop it on a CD, a HD, or access it via Ghostlink.
6) Follow the steps on my Wiki (http://netbsd-ataritt.wikia.com/wiki/NetBSD_on_the_Atari_TT030) to load the sysinst floppy, then go through the menu system. I install via FTP using a Riebl ethernet card, but you can also install via CD-ROM, etc.
Although my wiki really needs to be updated for 5.0, it should still be a lot of help. I'll be working on updating it in the next few weeks. If you hit an issue doing an install, definitely reach out to the port-atari mailing list (http://www.netbsd.org/mailinglists/#port-atari) for help.