One we've encountered recently (hiring a replacement contractor in my office) - don't make your resume buzzword bingo, nor should you have more than two or three pages of resume!
We got one, I kid you not, from a woman who had apparently been a contractor since graduating college about two and a half years ago. All her contracts were one to three months. Each one had FOUR PARAGRAPHS of job details. We got maybe two jobs per pages - seven pages long altogether. Single spaced, small font, no margins. Guess whose went on the 'toss' pile?
The resume we got from the guy that had been in the field for twenty years, knew everything there was to know about the thing we're hiring for? A page and a half. Easy to read. He's interviewing today.