Delicious

Delicious grew through partnerships, and a Mozilla deal more than tripled its users. Delicious built a custom interface for The Washington Post, and its Mozilla deal more than tripled its user base. An integration with Wikipedia failed.

Traction cites these as evidence that most partnership deals fail, so you need a long pipeline of 50 to 100 partners. It advises focusing on 10 to 20 chosen by attributes rather than brand names, and getting a warm intro to the person who owns the metric the deal moves. It also says to keep term sheets to one page and build the integration yourself. Quote: "You need to understand what's on their side of the table—what are their issues?"