[mikeryan]

This depends entirely on the business you are trying to build. Trying to generalize this into 2 people == 2 programmers == success isn't going to work in a vast majority of situations. Who's going to do business development if you have corporate clients? Who's going to do visual design?(programmers? Yikes!) Who's going to deal with investors and press?

This product didn't fail because there was only one programmer (heck I'm pretty sure digg started with obyrne and Kevin Rose). Fundable failed because it poorly managed itself.