[jack]

First, read pg's essay on the subject, if you haven't already: http://www.paulgraham.com/equity.html.

Although it's tough to revisit this question after you've already established a deal (it would easy be perceived as opportunistic), it can't hurt to ask.

At worst, the other founders should be able to justify the allocation you've been given and their reasons for not upping your share; at best, they might revisit their decision given how much value you've delivered over the past 7 months.

Just make sure raising the question doesn't come across as blackmail.