A beautiful desktop does not directly make your more productive, having a nice workspace does have a impact.<p>Another source for high resolution wallpaper goodness.
<a href="http://interfacelift.com/wallpaper_beta/downloads/date/any/?promo=disabled" rel="nofollow">http://interfacelift.com/wallpaper_beta/downloads/date/any/?...</a>
There are some nice photos on this site, but I think there is a lot junk that looks like it was created at the turn of the decade.<p>I'm a big fan of interface-lift.com and mandolux.com for my dual screen wallpapers. Sometimes I'll grab stuff from wikipedia's photo of the day.