The DM of my current Friday night game is running a steampunk-setting, using the Pathfinder rules system. We have two artificers in the party, but my feeling is that all of our material is fantasy and medieval tech, and anything that is modern or really "steampunk" is just being made up by the DM.

Are there any good source materials for steampunk or modern technology in d20? I am sorely underwhelmed by D20 Modern, and Spycraft is awesome, but doesn't play nicely with other d20 systems. I am also ruling out BESM, unless there is some supplemental material for it that's particular to modern weapons.