For all of you who have a flashy Apple MacBook (or any other device with a 1280x800 resolution) here's a nice site with lot's of hi-res wallpapers. Of course, they're all for free!
Oh, they have other sizes as well.
Go check out <ahref="http://interfacelift.com/wallpaper/index.php?sort=downloads&w=1280&h=800">InterfaceLIFT</a>.