Bla.st
I like this Bla.st website. It is a web directory in essence, but with a twist. You can put up images of card-like sizes and list your site or blog according to tags. Best of all, its free (at least for now). I expect it to be very popular once the next Google PR comes along. For those looking for some exposure, get your site listed on Bla.st before they decide to charge people for it.
Kuddos to Tom from Bla.st. Amazing job promoting it!
Similar to his site (not a copycat!) but different at the same time (and I think, a little more useful) I created http://www.egaroo.com. It’s based solely in banners. My personal and humble project in creating a 100% free visual directory of interesting websites. I recopilate my favorites sites, create a banner, identify and upload them… yeah, lots of work, but I love it!