Let the PM manage getting commitments for you
At last night's IWST on time management, Chris Wingate shared a technique he uses when trying to coordinate performance testing for projects. Chris schedules two 30 minute meetings each week. Instead of constantly following up with people to see where they are and to see if he has everything he needs to proceed, he focuses on his part of the project and lets the project manager get and manage other people's commitments. This allows him to work several projects at the same time, because in each of them he's focusing only on his piece of the work and not trying to duplicate the effort of the PM.