I would be curious to know what you are all using Debian + HP/Compaq for in production environements also. Sometimes I am a Debian nutcase and sometimes feel guilty using it for production

We're currenly using Debian for our public web server. Within the next month or so, I'll be building out a new machine w/Debian for our internal web staging server and CVS repository.
Feeling guilty? Why? Because you're not using Windows?

My previous employer -- a network integrater and ISP -- runs almost everything w/Debian and has done so for eight years or so. They use it for their file server, DNS, mail, web, you name it. And when they implement a Linux server for a client, it runs Debian, too. There is one guy there who has some frustrations with Debian in terms of the inability to get current versions of everything on stable. In particular, they want to use the most current version of postfix but can't install it as a deb package under stable. They've had problems with compilations breaking with upgrades of other packages so they've had to resort to using backports in cases like postfix.
I ran Debian testing on my workstation for a couple of years and I was frustrated with the things that would break when I'd do an upgrade. I would say, based on all of that experience, if you're running stable, you don't have anything to feel guilty about. And if I'm to believe the more daring Debian users around me, testing would be OK, too; but you didn't hear that from me.
I'll throw this in, too: though I know that popularity is not necessarily a marker of a product's quality (MS has what percentage of the market?) I believe that it may not be an exaggeration to say that
everyone I know that runs Linux either on a home machine or a production or vanity server runs Debian.