More important is quality-do you have the right keywords in it to pull your resume out of the vast sea of electronic flotsam that HR or whomever is bombarded with.
This be the key. If you are just sending it in to a job service or directly to a company cold, it will be electronically screened looking for the right keywords. If you have been invited to send in your resume and know that a human will be looking at it, one page is normal unless it is an exec position or is highly technical. Don't include dates on your resume. You will be screened out for being too young or old if that is the case.
By the way, unless you are highly skilled, sending one into monster.com or even directly to a company in response to a job opening is a fishing expedition at best. It's not who you know, it's who you blow.......
and many of those positions if you're qualified you can't keep your qualifications in a single page. someone else said $100K plus which is a good point. between multiple degrees and/grad schools, internships, certifications, employment (some times many years), qualifications etc....impossible to keep to one page.