Google uses CSS for Images
 

I knew this is used by Youtube only because youtube being a bandwidth heavy website

http://s.ytimg.com/yt/img/master-vfl93996.png

Bit its now the Big G also implemented the same and so probably its time to move on to it and get save server resource. See this

http://www.google.com.au/images/nav_logo4.png

So it makes loading images much faster for Google also now.

Re: Google uses CSS for Images
 

does this really work without quirks with IE <7?

Re: Google uses CSS for Images
 

Any browser which supports CSS should be and I am sure IE 6 also supports it