That will probably not be necessary; if they want you to code they'll likely have facilities (whiteboard, etc) for you.

I would disagree..On occasions where I have been asked to pair program with one of their developers, it is definitely more optimal to use your own machine (E.g. my mac has natural sense scrolling turned off, caps lock and ctrl swapped etc). Also, nowadays, I have been seeing interviewers who ask me if I want to write code on a laptop rather than at a whiteboard. This is a welcome trend (but seen only in startups though)

Cool. Thanks!! I'm a little nervous about using a whiteboard to code on =\ never really done it before. i just start hammering stuff out in gedit lol.

Thanks everyone for all the wonderful tips!