Mark is right on. Most resumes appear like a scrabble of words. 'Summary' is probably the most important part, which if phrased right, will provide the hiring manager enough information to want him/her to read the rest.
Shorter the resume, the more readable it gets. I have seen highly qualified and experienced individuals having a 'One' page resume and in its brevity it speak volumes. Every line item should have a unique value proposition.
If you are job hunting, then its absolutely essential that your LinkedIn profile is completely updated and syncs with the printed resumes that you send out. Almost every manager that I know of is looking at LinkedIn to get some background information. Get as many recommendations as possible.
Another important factor is general online presence. Employers are also looking at social sites such as Facebook and Myspace. Make sure that your online presence does not cause you any embarrassment down the road.