Y! launching personalized search isn't *that* surprising though. With the aforementioned launch of A9 and myJeeves, Yahoo! executives were probably jealous of the press their rivals were receiving. How hard would this technology be to develop for a company the size of Yahoo anyway? I wouldn't be surprised if the CEO made a demand for personalized search, and the tech team responded.
I still don't think url blocking and a searchable bookmark list qualifies as "personalized search"; however, I guess it's a start..
From Y!, emphasis added:
I'd say that's akin to saying the wheel was the beginning of mass transit, but you have to start somewhere.