RocketNews personalization

RocketNews issues a press release claiming "unique personalization features". Among other things, they say:

RocketNews tracks the articles visitors click to read, and these individual choices are used to determine the relevance and ranking of search results every time the individual returns to RocketNews to view their searches or their personal news portal.

But I wasn't able to see any changes to the RocketNews portal after reading several articles.

RocketNews does appear to keep search history, as do many others (My Yahoo Search, A9, MyJeeves, Findory).

Gary Price has more on the RocketNews announcement.