1) Gentoo (who cares about the number, it's all compiling from source anyway

). Officially it's 1.4, but it was installed with my old 1.4_rc4 disc, so that really has little sense. But it's using gcc3.3.1 and I'm using the 2.6.0-test6-mm4 kernel, with all sorts of weird usability patches. And almost everything is bleeding edge, like GNOME 2.4 (with several patches to improve various stuff, especially the file picker, and another thing that adds shadows to menu), GIMP-1.3.21 and the ximianized version of Openoffice that makes it use the gtk theme for its colors.
2) Amd Athlon 850Mhz, 384 MB RAM, 20 GB (6GB as a FAT partition for both linux and win, 100 MB for /boot using ext3, 200 MB for the swap, and the rest for / using ReiserFS)/8 GB hard drive (NTFS), Radeon 7200 and a usb ethernet card.
3) I played a few old games through wine, like starcraft, but that's not really great. Played some free games, like freeciv, but again, they were not as great as their windows counterparts. However, I'm planning to try to get a few games that were ported to linux, like maybe utlimate tournament 2003, alpha centauri or sim city 3k.
4) On server and on the corporate workstation, yes that's sure. Linux (or another free kernel, like maybe open darwin, or even the Hurd someday, or actually any *BSD) will eventually overtake windows, and the old Unices, as companies are looking for cost-effective solutions and stability. Windows is not stable enough for mission-critical situations, and the Unices are too expensive, and proprietary, which means that in the end, you can't customize it enough, if that's what you need. And big corporations need this. But on the desktop, it will take a very long time, if it ever happens.
Edit : Oops, forgot to talk about my 2 other comps
Mandrake 9.1 (which is quite broken now I must say

) : Athlon t-bird 900, 512 MB RAM, 80 GB hard drive (~55 GB for windows xp on fat, the rest for linux), Radeon 7500, and other basic accessories.
Gento (once again) : Pentium 133, a wonderful 6 GB hard drive, a whole 40 MB of good ol' EDO RAM, an unknown 512kb video card and a cd-drive that can't read cd-rw (which forces me to rip the cd-drive from the athlon 850 whenever I need to read cd-rw on this one

). It takes about 3 days of compilation just to get to the marvelous command-line
