The one page resume is utter bullshit. Use the minimum number of pages you need to make your sales pitch. Brevity is a great thing but don't feel compelled to keep it to a single page.

I look at hundreds of resumes a year. What I care about is grammar, making your point, and more than anything your ACCOMPLISHMENTS while in your role. Do not give me a job description - tell me how you took your job to the next level, tell me how your actions set you apart from your peers, tell me why you are the one for me. More than anything show me you can be successful when I give you a challenge.