To Fred's credit he punts to Russell from WorkMarket. Russell's post is a decent but incomplete list of lead-gen tactics.
Notably, he doesn't discuss it from a strategic marketing perspective, so keep that in mind.
Also keep in mind a lot of the comments are not good advice, some from observers of sales and marketing and not from market builders.
This is one area where you want to pay attention to people like Phil Sugar, and avoid other sugar-coated platitudes. Phil knows how to carry a bag and has both the air miles and battle scars to prove it.
While you're at it, go read the following folks about lead generation, selling, marketing, traction, etc. All were/are successful entrepreneurs: