I have Debian GNU/Linux happily running on my laptop, though my laptop is pretty pokey (it's an Inspiron 7000 that I bought in 1998).
My server at Serverbeach (bluesock.org) runs Debian and it was doing fine until the kernel switched the / mount to read-only and then died. Rebooting caused the server to fsck everything and I lost /var/lib and /var/cache... Then things got pretty interesting for a few hours. My friend gave me a tarball of his /var/lib (minus some random stuff) and from that and some useful files in /var/backup, I was able to bring most of the server back to life. Additionally, I found some of the files that were missing in lost+found. Tawdry things like mailing list archives dating back to 2000. Time to institute a more rigorous backup system that includes more data....
My dad loaned me one of his monster servers (see figure 1) because it was non-functional. My roommate pulled all the stuff out and put it back in again and now it works fine... Not clear what the actual issue was. Anyhow, once I get it booting, I'm going to slap Debian on that machine and start using it for development. Then I'll switch my pokey laptop to mirroring/backing-up bluesock.org.
I've been really happy with Debian. As happy as I was with Gentoo, except I don't have to wait hours for X and various other large things to compile.
figure 1: an ascii picture of me standing next to the server