You are hosed.
It comes with a USB cable: http://www.usa.canon.com/consumer/c...&fcategoryid=177&modelid=16187#BoxContentsActI thought the HF100 used flash memory (does it even have firewire?) - can't you just take the card out and put it in a reader?
If you've got the 15" MBP in your sig why wouldn't you stick with it? It's a fine computer and it has firewire. You want firewire for your audio, USB 2 is a step backwards.
My advice:
Keep the MPB for as long as you can then get a new MBP with firewire.