Here's an overview story I did about the founders of the pioneering video blog Rocketboom splitting up. (After speaking with both of them.)
Despite the drama of how this is unwinding, a contributing factor was that Rocketboom was still working to bring in an ongoing stream of advertising. Amanda Congdon and Andrew Michael Baron had been working together for more than 18 months, pioneering a commercial model for a new medium. That's pretty hard.
I agree with Chuck Olsen, a Rocketboom correspondant who tried to help mediate discussions at the end, who says in the story that if they were on firmer financial footing, they probably would have figured out how to work together. As Chuck writes in his blog: "Lack of money certainly doesn't help most relationships."