I started with Sphere and searched for items within the last 12 hours on yesterday's Vista delay announcement. The search generated four items.
A similar search on Technorati produced six items. Clearly, the interface was more cluttered. Also, I was a little annoyed when I accidentally started reading the sponsored links (They're embedded in the results and my middle-aged eyes had to squint to see that these were sponsored.)
A search on Feedster produced plenty of items, including one for the TV show "Sopranos." Narrowing the results by timeframe required a trip to advanced options and reading a bunch of instructions, something I avoid whenever possible. On the upside, the sponsored links are on the side of the page and easy to avoid.