I am in the same boat - at least a year away from my green card, working for BigCo, moonlighting, even turning 30 soon!
I've researched a couple of options to expedite green card processing and these may be applicable to your case - email johnbray8 at google's email service to chat.
Would YC consider accepting founders who can't work full time on their idea? We have been working part time on our product for the last few months and will launch later this year. We don't expect to clear immigration hurdles till sometime in 2010. Does it make sense to apply?
I've researched a couple of options to expedite green card processing and these may be applicable to your case - email johnbray8 at google's email service to chat.