Kingoftherings: I'm going to be different.
I use Gentoo Linux on my desktop, Fedora 11 on my laptop, and Arch Linux on my Eee PC.
However, my desktop duals boots Vista too. I couldn't get XP to install. It wouldn't let me use my keyboard. :(
LordCinnamon: Arch Linux! Woohoo!
<runs around in his penguin-print underwear>
How's Gentoo? That's the one where you have to compile everything yourself, right?
How's that working out for you?
Anyway, I have a dual boot vista/arch linux. Vista has as many fluff disabled as possible, and I'm reasonably content with it. I plan to look into W7 though.
Arch Linux is pretty simple. Openbox window manager with a great tiling script and dmenu to run most programs. I do most things via the console, actually.
Also, I don't really have linux themed underwear. The most geeky thing I have is my VERY AWESOME GOG shirt.
Yeah, you compile everything in Gentoo. I've found that it's really similar to Arch. It has a nice package manager that does all the work for you. You can enable some CFLAGS and stuff so stuff that is compiled is optimized for your CPU (the difference isn't that big).
You can just do: emerge firefox, and it will download and compile firefox and whatever else it depends on. There are also use flags, so if you want to compile Pidgin, but don't want the Gtk gui, you can disable Gtk, so it won't pull in all the Gtk dependencies like Arch will.
RahaMies: Sadly, I don't find any use for a Linux distro... otherwise I would use a linux and have some geek points by simply having one (not that Ubuntu...).
Performance is a huge advantage for Linux. Ever noticed how after 6 months to a year Windows runs much slower than it did initially? That doesn't happen on Linux. You don't even need to reboot when you update stuff. If you run a server, you can have uptimes on Linux in the years. Windows is really annoying about rebooting.
Linux has a better software install method. Instead of going to mozilla.com to get firefox, pidgin.im to get pidgin, or apple.com to get itunes, you can get all that from a package manager (except itunes, but there are alternatives). A package manager will get you 99% of the software you want, you just search for what you want, click install and it does the rest.