Check out the new Halo themed version of tafiti.
I had already posted about Tafiti, on its release. (Microsoft Tafiti - Silverlight based search front end)
Tafiti, uses Silverlight and Live Search and gives a richer experience in search.
And now a special themed version of tafiti is released to celebrate release of Halo3.
There's also an option to use Original tafiti by clicking the option provided on top right "Click here for Original tafiti"
Also there's a specialized search with Halo icon along with image, web, news and feeds search which gives sites related to this game.
Check out this, even if you are not a Halo fan. Its cool !