Novell's SUSE Linux Enterprise 10 (SLED 10).
It is really a tight and well thought-out distro. I have it on several machines now and I am ecstatic with it.
I am constantly having to tweak and prod my Windows XP machines to keep them going and on task--particularly with security updates and related patches. But I never realized how much babysitting my Windows XP machines require until I installed SLED 10 on some machines.
Unlike the Windows XP machines, the SLED 10 machines are rock solid and completely self-sufficient. They never complain, never make demands. They just do perfectly and efficiently exactly what they've been asked to do, first time, every time, around the clock.
It appears to address some -minor- annoyances I had with Red Hat. I do run a business and have limited time for tweaking kernal updates, etc.
I must comment that because I have rules about what I allow to run, I have never, never had a crash with WinXP, but the "Genuine Advantage" and other surveillance "improvements" alienate me to the extent that I am ready to toss it. I run...lessee, three laptops and six desk boxes here. Change a drive, add RAM, etc, and then have to call Redmond and BEG to use a product I bought and paid for? Ha.
I am old-fashioned and do not like the doctrine that when I BUY something it is not my property, as implied in shrink-wrap contracts.