Well, there is one thing in Microsoft new Search Beta Suite that has got me buzzing for sure, MSN Search DeskBar. I was annoyed with it at first, but it has turned it to a little useful component. You can drag it to any side of your screen and have a sweet little SideBar (Longhorn), it gets even more interesting when you are doing search, (check out the screenshot below.
Its almost like it incorporates some WinFS technologies, where you filter down the search of a file until you have found the right one. This is really, really cool and the auto-hide feature makes it even more of hit.
I love this feature, if its stuck on your task bar, make sure that you unlock it first then drag it out.