I like to use Bing because its search results often differ from googles, so I often find new sites.

But it is a pity that the German version is still Beta.

maps.bing.com is one of my favorite features, especially of Bird's eye mode

Also Live-preview in videos search is very nice, so you can save a lot of time to find wanted vids.

Everyday changing background pictures are varied and pretty to watch but its not very important to me.