I much prefer TabKing's weighted features Rated 3 out of 5 stars
This adds a feature that IE7pro has offered for some time. Tab King, however, auto populates new tabs with sites most frequently viewed.
If fast dial added that as an option it would be a five star extension :)
It is possible in Fast Dal with right click Sort/Viewed to sort the cells in Fast Dial according to which cell is most viewed.
The most viewed is derived from the most viewed in History
Is that the sort of thing you were after