I run three of my own servers...
Fedora 6, running Apache, MySQL, PHP5 (always stable)
Two 500gb drives, RAID 0 (mirrored)
Same setup as above, just some older hardware.
Debian (forget what version), Apache, MySQL, PHP5 (always latest)
Two 160gb drives, RAID 0
I also run my own business doing web design, web application design (think of stuff like Google Documents, just not quite as big or as nice. But applications like that. Usually done in PHP and company), and I host most of my clients after building their site. Some, who want more bandwidth, I refer to other companies.
Just getting into the whole flash-based applications now. I'll never do flash based websites... gets you a horrible google page rank, since google can't read the text, and its usually just plain annoying. But, flash based applications are awesome.
So yeah, basically a webmaster and Linux system admin. Stinks when a server goofs up... I have to find out why and fix it within 15 minutes, or I start refunding customers. But, thats why I have a live backup.
Just swap the incoming local IP addresses, and the other one is live!