I've been using Slackware since Slackware 8, so I have a bit of experience with it.  I've run Slackware on various machines, some of which I've retired or have died of old age.  Currently I've got four machines I use on a regular basis and all are running Slackware 13.

Dell Precision M6300 - This laptop is my main machine and runs Slackware 13 64 bit multilib.  I do the vast majority of my work on this and consider it my "production" machine.  Changes don't happen on this rig unless they are tested out on my homebrew machine first.

Dell Mini 9 - I LOVE this netbook!  I got it originally because I was finding that the M6300 is just too big and heavy for travelling.  On an airplane, the M6300 is completely useless if the person in front puts their seat back.  The Mini 9 has been a real eye-opener.  Not only is the form factor fantastic for travel, it actually is powerful enough for general use.  Yes, it is noticably slower than the M6300, but since I use it predominantely for travelling and notetaking at meetings, I don't mind.  I upgraded the RAM to 2GB and am thinking seriously about putting a bigger SSD in there (currently it has 16GB which is kind of tight even if I keep my data on a 16GB SDHC card.  It runs Slackware 13 32 bit.

Dell Dimension 2400 - This is a bare-bones machine that I use as my server.  It hosts this site as well as a few other things I find useful.  I've added disk space to it so that it serves as a general backup machine for my entire network.   It runs Slackware 13 32 bit

Homebrew - This is a machine I built myself (my first build!) and it dual boots Windows XP and Slackware 13 64 bit multilib.  I use this primarily as a testing platform.  Since my M6300 is my work machine, I can't upgrade it until I'm sure that the upgrades won't break stuff.  This machine allows me to do that testing.

I know that I have a lot of Dells, but the fact of the matter is that Dell has always treated me very, very well.  In one instance with a relative's computer, Dell really stepped up to the plate and solved a problem when it was very clear that they didn't have to.  People may have had problems with Dell, but I'm not one of them.