I know i repeat myself. I have no idea how Marc Andreessen has the time such long insightful posts on VCs and Startup (and other stuff). But he's part 3 dedicated to how get the attention of VC when you don't know any of them is right on the spot.
If i may add a suggestion to Marc's extensive list: write a good blog or in a good blog. Personally this is how i got spotted and joined my current position from nowhere being still Ole Hadach (recent immigrant) in Israel. I am sure this could also help entrepreneurs getting my attention and other vc's attention