Therein lies one of the biggest problems with the new Aluminum MacBooks, and much of the reason that the community has been up in arms over the lack of a Firewire port and no good alternative. When asked about whether he thought it was a mistake not to include Firewire in the new MacBooks, Steve Jobs remarked that most of the newer DV camcorders use USB. Of course, this is pretty short-sighted, seeing as how the vast majority of existing MiniDV camcorders use Firewire as the interface of choice.
Unfortunately, my friend, your options are pretty limited. You could look into a USB to Firewire adapter, but I'm not sure how well (or if) they work with Macs. Alternatively, if you have a desktop PC, you can always pop a FW card into it and transfer your videos that way. Otherwise, you're limited to doing an analog to digital conversion (not the ideal way to do it, of course).