Adding qdr=y to search url we can see the combo:

http://www.google.com/search?q=Google&as_qdr=y

yes thats a nice find..!! I like that feature

this feature is already in the advanced search options. maybe there are different switches that turn on these advanced features in the basic search screen?

i've tried a few but can't get it to do it

Merci beaucoup mon petit Telendro!

Yeah! I found one of this interface experiments last sunday at work.
Now is gone.

http://michperu.blogspot.com/2006/03/google-probando-nueva-pgina-principal.html