Is there a usb or firewire adaptor that will let me plug in my coles xlr lip mic for voiceovers. i want to skip using the camera and just plug it in direct. Is this possible. If so what can I use?

There are literally too many devices like this to list. Check out some options from M-audio on the cheap. Presonus also makes little device called the Firebox (or Firepod or something) that seems like a reasonable unit for the price.

the Presonus Firebox unit is a nice firewire preamp, SoundDevices do a nice usb preamp called USBPre

but i think you might even consider these too:
http://www.griffintechnology.com/products/garagebandcables/
http://www.soundtech.com/lightsnake/xlr10.asp

probably get a better price if you search around online

alos consider the macmice micplug (discontinued, but still available online)

the main problem is the impedence level of 300 ohms. Very low for a lot of adaptors. Will any xlr usb/firewire adaptors work with this?

we use the USBPre box, it works very well. we also tend to just use a Shure field mixer