Even if you have your resume written by a professional, check it for errors several times. The most minor error can become a major problem on the rough road to an interview. However, since Times Roman font resumes do not fax well, use Arial for resumes you intend to fax. We've seen some great-looking resumes on the screens of word processors, but when fax'd from that word processor the centering, line breaks, and page breaks were all wrong when received by a fax. And then take your fax'd resume, and fax it to yourself again.
Short resumes are much easier to read than long resumes.
The first redundancy we see on a resume, we often quit reading the rest of the resume. Short resumes get more attention than long resumes. If you have several years of experience, use the columns of a table to break up this summary into sub-categories. Always list your skills in order of proficiency, highest proficiency to lowest proficiency. If it isn't completely obvious from the very look of your carefully crafted piece of paper that it's a resume, go buy a good resume book or hire a professional resume writer.