Definitely think app.net benefits here as they rely heavily on the acceptance of the developer community and early adopter types that make up YC companies.
I think the new part-time partners provide a nice diversity of experience. It seems to be a little more on the consumer side, though Andrew Mason's experience in building a salesforce might add insight into enterprise sales but it's hard for me to know that from the outside. imeem and App.net on Dalton's side of things probably caters more towards the business development and community side of things, if I'm not mistaken.
I think this is even more advantageous for the entrepreneurs than it is for Dalton. He is an absolute legend. He's been fed more crap, and has been on the cusp of more trends than most other entrepreneurs I can think of, and still has a kick ass attitude. Awesome work YC.
I think for app.net this can only be a good thing. Even if Dalton does loose some of the time he could be putting into the platform the early stage visibility it gets will be a huge boost to the community.
It is still a bit of a shame that those brought in to ADN via YC will be more of the same. I would love to be able to move some of the awesome people in the game dev community over to ADN.
