Get them from National Geographic's website:
-http://magma.nationalgeographic.com/ngm/exploration/wallpaper01.html

Ooooooooohhhhhhhhhh.... pretty cool find .... good wallpapers are hard to find these days, especially ones with no adware involved.

This site has some neat wallpaper, unfortunately it is down all the time due to the 40 MB per day transfer limit. There was another site that hosted similar wallpaper, but it's not free anymore... oh well

http://www.shari.bravepages.com/

My favorite, but some pop-ups on this one: (awesome resolution though)

http://www.interfacelift.com/wallpaper/popular.php

Digital Blasphemy (it gets better every time I visit):

http://www.digitalblasphemy.com/

And finally Hubble telescope pics:

http://hubblesite.org/gallery/wallpaper/

I am also a fan of Digital Blasphemy & the Hubble telescope shots & love collecting wallpaper. The National Geographic site has given me some great animal WPs - a favorite is a polar bear & her two cubs. Hard to believe that something that cute can be that dangerous - further proof of the old adage "looks can be deceiving".

I was going to recommend screensandthemes.com (links to some nice sites) and Chappel's site: chappel.surfhoo.com but neither of my links seem to be working at the moment. I especially hope the chappel site unavailability is only temporary - she is a very creative lady & I also use several of her cursors.

My favorite catagories are scifi & fantasy, especially 3D. I am going to preview cool3dwallpaper.com later - looks like it has potential.

Anyone using Firefox should take a look at the Image Toolbar extension - speeds up the save to disk process. I do recommend use of JPEGscan by DiamondCS to provide some safety at yet another nasty. It's free and DiamondCS has a good reputation for security products.

Slim