As a general rule, one page is the recommended length. This may vary if you have extensive experience. Do not sacrifice margins and white space to keep your resume to one page. The use of scanning and OCR technology is changing the way employers deal with incoming resumes and the way resumes are being written. You may want to take into consideration the guidelines below if you anticipate that employers of interest to you may be using this new technology.
Scanners search resumes for keywords relevant to the job and the employing organization.
Use words in your resume that you think your target employers would use in a search for candidates. Scanning equipment is confused by any characters that touch each other or run together. The underlining and italics in the others could render them unreadable by a scanner. Before you write your final draft, have your resume critiqued for content and style. UCS staff or employers may be of particular help here.