When I started out assessing Linux I got four flavours - Red Hat, Mandrake, Slackware and SuSe. All had advantages and disadvantages. Not much has changed in that respect.
I now use Slackware Linux on three systems (paid money even :-) -- But you can also download through Bit Torrent - I just got the latest Slackware 10.1 -- it looks pretty good. This will be the last release with the 2.4 kernel (2.4.29). KDE desktop is 3.3.2 . Much slicker now.
Also -- we packed in our NT Server for a Linux Mandrake server running on the AMD64 (ASUS K8VSE-Deluxe board) The software is a lot cheaper and we don't have all the security holes of Windows Server 2000. (2.6 currently KDE 3.2.3) Got a (almost) free version somehow (forget how it came to me) a few months ago, but I will pay full price for the next major upgrade - since it does work reliably.
Openoffice satisfies almost all our business needs other than accounting.
Linux User Magazine -- large format -- usually has a a community edition release of one of the Linux flavours every month on the accompanying DVD.
I just noticed that 3 out of 5 machines near me are currently running Linux for development purposes. Funny -- cause I was thinking it was mostly Windows in our little shop.
Windows XP is required here because we use software for images processing and accounting for which we have not found better Linux alternatives. One machine left on Windows 2000 -- but the user better switch soon or I will pull their network cable.
You can buy magaz> Where are you guys getting Linux from? As well, any associated applications