I run Linux.  I don't quite qualify as fanatical about it, but somewhere on the fanatical side of dedicated.  Every machine I own has Linux on it, to some degree or another.  I'll spare the long diatribes praising every Finnish lunatic who's ever contributed code.  I like it.  I don't run any Micro$oft stuff because of it.  And there are many more reasons I'm not goign to go into.  :)

 A screenshot of my desktop.  It's not an especially typical representation, since I made it for purposes of showing off rather than accurate depiction of what it usually looks like.  Normally it contains Netscape and a ton of xterms.  This just looked better.  On it we have, working clockwise from top left:

• Netscape Navigator 4.04 -- can't say I'm thrilled to have to use Netscape's products, but it's more or less a requirement in my line of work to have a "modern" browser, and NS is a fair bit better than the other "modern" browser lurking in the industry.  Even if M$ saw fit to provide a version of M$IE for Linux, I've seen how bloated it is on Solaris -- I'd rather use arena, or lynx, if it came to that.  The makers of Opera have recently announced an intention to make their browser multiplatform, including support for X, but they may be hampered by how hard it can be to port a Windoze app to X - essentially you have to add an entire GUI abstraction layer; also Netscape's announcement of intent to release source code may mean the GNU project brings its considerable resources to bear there, outstripping Opera.  We'll see.
• Solaris' Solstice Suite -- not a Linux app, this.  I haven't gotten over how nice it is to run programs all over the place and display them on whatever other machines you choose.  I don't like Solaris all that much, but until Sybase or Oracle sees fit to provide a (decent) Linux version of their database servers (Sybase has a Linux version but won't support it; Oracle has a Linux version but wont' release it), I'm stuck with it.  The machine it's running on is coral, my company's only non-Linux server; coral's perfmeter display is in the bottom right.
• Mutt v0.88 -- My mailreader of choice.  Decent features, excellent speed, supports PGP and Maildir, regexp matching, flexible configuration, and -- saving grace above all -- it's not pine.
• WWIV -- actually, a login to my BBS.  Yes, they still exist.  WWIV was a DOS-based BBS software that I got into around 1990.  The board's been up almost continuously since July 1992.  For the last year and a half it's been running on one of my Linux machines.
• fvwm2 menus -- nothing much elaborate.  I've tried to get into the habit of using them to run stuff that doesn't need an xterm (X apps, IOW), to avoid wasting RAM, but haven't done too well.
• Lyn v0.8a.5L -- The CD player program I wrote.  Curses-based, CDDB database capable, X aware, etc.
• top -- Fairly easy command for the novices, and the non-novices seem to keep using it even after they get to be experts with ps.  This copy was running on Sonoma.Net's primary webserver, a dual-PPro Linux box that serves 150 or so sites, three of them pulling a half-million or more hits a month.
• Over on the right side, the fvwm2 buttonbar.  Much as a more aesthetic rendering of a buttonbar would be nice, I've yet to find a windowmanager with a better buttonbar for the purpose of actually doing things, as opposed to merely looking nice and eating RAM.  The mailbox program is coolmail v1.3, with my Maildir patches; the various machine logins all have ssh-proxied swallowed xloads associated with them.  The logins themselves are all ssh-encrypted, letting root passwords, PGP passphrases, and drippingly erotic prose be typed without fear.  I adore encryption, but that's another issue entirely.  The meters below the pager are copies of perf(1), Sun's RPC-based system monitoring utility.  It works off of rstatd, and provides a fair amount of quite helpful data.  The Linux version of rstatd, sadly, supports fairly few of the meters.  The top meter was showing all that green (niced) CPU activity because the machine was cracking DES keys for distributed.net.
• The root window contains a fractal from Walnut Creek CDROM's "Fractal Frenzy" CD, circa 1993.  There's a tiny shell script that loads a random fractal in the root window every 6 hours or whatever it was set at.  All of the fractals on the CD were in, at most, 1024x768, hence the graininess when blown up to 1600x1200 (yes, it's a big monitor.  Matrox Millenium 4MB on a 20" Magnavox display -- been worth its cost many times over, in terms of more comfortable workspace and quicker movement between programs.  "Maximize" an app?  Surely you jest.  :))