Regulation of bitcoin in some sense is inevitable and probably desirable, but it's important to recognize that the only sense in which bitcoin can be realistically regulated has to do with the ways that bitcoin interfaces with the traditional financial system.  So, exchanges, like MtGox, can be compelled to behave in certain ways by the financial regulations of their jurisdictions.  They can be held to standards of accounting and reporting, say, and face fines or interference for not complying.

A unique aspect of bitcoin is that transacting only in the bitcoin ecosystem, away from points of contact with the traditional financial system, is to transact in a system that is pretty strongly resistant to typical top-down regulation from entities like states.  Users can more easily choose whether they operate in the regulated space or the unregulated space.

In a discussion on regulation, I think it's important to make this distinction.  If somebody, like some members of the Foundation, are pro-regulation, it doesn't necessarily mean they believe that bitcoin itself should or will be regulated - it probably just can't be regulated in a practical way.  What they are likely talking about are regulations to do with certain ways that bitcoin comes in contact with traditional financial systems where states already enforce regulations.