The challenge has been appearing on my facebook feed recently, so I took it a little while ago.
Google 4 - 1 Bing
I can remember three of my searches:
"ebay password leak"
Bing won the homeopathy one I think (Google only linked to "homeopathy is awesome" pages).
Obviously Google won the rest (Bing's password leak results were from several years ago).
by hyperoptimising Bing for celebrities and reality TV and then asking a bunch of idiots.
If that's what most traffic is, then it's not exactly a bad thing.