Here are some links I think you ought to try out. At first I tried to list them in order of importance relative to each group but then I came to the conclusion that it was a bit too difficult. I mean, so that you know...

    Wallpapers / Desktops / Themes
  1. Renoiro's Wallpapers (look at these and be amazed, then download) (top image quality)
  2. Free Desktop Wallpapers (bunches of great wallpapers) (top image quality)
  3. Babe Desktop (beautiful images, wallpapers and screensavers) (medium image quality)
  4. Digital Blasphemy (computer rendered wallpapers) (top image quality)
  5. Window Maker Themes (great themes for Window Maker, also nice wallpapers) (top image quality)
  6. Themes.org (many nice themes and wallpapers for X) (top image quality)
  7. Tucows Unix Themes (bunches of great themes for WindowMaker, Enlightenment and KDE)

    Photography
  1. CyberPhoto (great camera and camera accessories store) (in Swedish)
  2. Foto (the biggest photo magazine in Sweden) (in Swedish)
  3. Fotomagazin (great photo magazine) (in German)

    Art / Photographs
  1. Elfwood (fantasy art at Lindköpings Universitet) (medium image quality)
  2. Erotic Pixels (nice high-resolution photographs of beautiful women)
  3. Beautiful Women '99 (beautiful high-res photos of women)

    Computers / Operating Systems
  1. Linuxberg (tons of great Linux software) (click here for main site)
  2. Palm V Software (tons of great Palm software from Tucows)
  3. Uk.linux.org (linux page maintained by the mighty Alan Cox)
  4. LinuX.co.uk (intro to linux, full of flash animations, click here for non-flash page)
  5. The Linux HOWTO Index (great resource of Linux-oriented documentation)
  6. The Linux Documentation Project (bunches of free books about Linux)
  7. linux3D.org (lots of info on 3D in Linux)
  8. Linux Knowledge Base (like Microsoft Knowledge Base but for our great OS instead)
  9. Linux @ ABC-klubben (lots of info about Linux and similar OSes)
  10. Gnome Software List (bunches of great gnome software)
  11. LIVID - The Linux Video Project (info on how to play DVDs and MPEGs under Linux)

    Weather and strange phenomena
  1. Stormchasing (a great page for and about stormchasers) (low bandwidth)
  2. SMHI (here you can get forcasts for Sweden - great)
  3. Weatherguys (forcasts and other stuff)
  4. WeatherAffects (lots of info on weather)
  5. The Goes Weather Satellite (info and pictures received by the Goes weather satellite)
  6. The Tornado Project (lots of info on tornados, twisters and the movie Twister)

    Programming
  1. Dr. Dobb's Programmers Vault (support for lots of OSes)
  2. Linux Game Development Center (great info on how to makes games for the Linux platform)
  3. OpenGL Tutorial (a great introduction to OpenGL programming)
  4. FreeCode (bunches of free code to use)

    Comics / Stories
  1. User Friendly (the best comic strip around)