Technically speaking, it depends on the schools you're applying to and whether they require you to submit a résumé. However, I always advise applicants to include résumés with their applications, for two reasons: (1) It allows you to provide a one-page snapshot to the Admissions Committee that quickly showcases your academic, extracurricular, and professional achievements, and (2) It allows you to put those achievements out there without having to do so in the personal statement.
Definitely spend some time revamping and maximizing your résumé before you send it in. Don't simply assume that the one you've been using to get temp jobs during the summers is good enough. Your résumé needs to look polished and professional--remember, in many cases, it is the first piece of paper that AdComs will pull out of your file, and you want to make sure that first impression is a good one. Don't let them make assumptions as to your organizational or professional attributes based on a shoddy résumé. I can definitely go into more detail if you have specific questions you'd like to ask about your particular résumé, but here's a couple of points to keep in mind while you polish up your current version:
1. Your name, address, phone, and email need to be at the top of the page. They do NOT, however, need to be in 20-point font. You can easily have a two-line contact info that looks like this:
Joe Applicant123 Main Street, Anytown, ST 12345 • (123) 456-7890 •
email@address.com2. Make it easy to read. This is as simple as justifying all your text to the left of the page and bulleting your points. Don't write huge chunks of text in your résumé. A résumé is meant to be a meaningful summary of your accomplishments; don't bog it down with lengthy text. Be concise.
3. Provide explanations for awards, projects, groups, and companies/jobs that aren't readily known. Don't assume that everyone will know what you mean by
technical architect or that the witty or punny title of your senior thesis makes it obvious what it was about. Also, make sure to give the background and numbers for awards and GPAs. Don't just say, "Awarded Brown Medal in Mathematics." Say, "Awarded Brown Medal in Mathematics. This award is given to the graduating senior with the highest GPA in the major, who is considered by the faculty to have given the greatest contribution to the department." Add a little background, tout your achievements a little. Don't be afraid to talk yourself up with explanations. Also, particularly with the GPA, provide context. If your GPA-within-major was a 2.7, but the average GPA-within-major for your major is a 2.0, make sure to note that (i.e., "GPA-within-major: 2.7 (School-wide average: 2.0))").
4. Use clear action verbs and active voice.
5. DON'T include unnecessary information, such as your LSAT score, résumé "purpose" (i.e., "Purpose: To obtain admittance to a top U.S. law school."), or "References available upon request" line. Also, please
please don't reference your SAT scores or any high school information unless it is absolutely necessary (and by "absolutely necessary" I mean something truly relevant, like the fact that you started an organization in high school that has since gone national, and you still headed it up during college. And, even then, the only high school thing that should be in your résumé should be the line, "...begun in [Applicant's] junior year of high school...").
6. DON'T go over one page. AdComs aren't looking for a curriculum vitae, they want a summary. Also, in many cases, it could be considered presumptuous if a 21-year-old recent college graduate sends in a 3 or 4 page résumé. If you're going over, look for things to cut -- any jobs held in high school can go, as can extracurriculars for which you didn't hold office or didn't attend regularly.
I can definitely help out more if you have specific questions on your own résume. Let me know.