The problem is most of the people that filter through the resumes are HR folks, in one case I heard of one dropping a resume because the IT candidate didnt' have "TCP/IP experience" on their resume, so the format matters less than the content in this case. Still, .doc is the standard, I write mine in Open Office, but test it in MS Office since that's what they'll open it with. I always have a PDF on hand as well, but when you're searching for a job you don't want to be the one sub'ing a resume in a format they're not expecting.

Of course when I review resumes I prefer text, with extra credit if it was written with vi!