Sorry if someone else has posted this previously and I being stupid missed it but
Google Blog Search
That opens up a whole new marketing world for me. Find all the blogs on hundreds of keywords and post your links - Holy Shit it's vast. It's off the scales for potential.
And like I said - if I've missed it before I apologise - but if I'm correct and no one has spotted it before -rep points for David -Who's a cheeky sod