Microsoft launched an other search engine today under the name of Windows Live Search. Personally, I hate it. (1) It doesn't work on Apple Safari. (2) It seems to be using an AJAX interface, which seems to load slow. (3) The UI is different enough from the standard to be annoying. (4) It looks like you can only get 20 results, I am not sure how to get more at this time (looking at it for a minute or two).
Chris Sherman has his write up here where he said that the "differences between Windows Live Search and MSN search appear to be largely cosmetic with the introduction of this beta, with the addition of some additional user interface controls and a few other features."