I am sure you would have developed a fairly good idea of how to compose your resume after going through the advice and links posted by Jon and Bhavik. However, here are a few basic points that you may find useful:
1. Use powerful action verbs to begin bullet points when you are listing your responsibilities in the work experience section. The idea is to convey leadership, active contribution, and impact.
2. If you have been promoted within the organisation, please ensure your job description (under each designation) shows growth/progress in terms of incremental responsibilities and scope of work.
3. Have an Awards & Achievements section in the resume.
4. Quantify your responsibilities and achievements as far as possible. If you do not have the exact figures for everything, even approximate values would do. This will help the ad com to understand the magnitude of your work and the results achieved.
5. If you have been the first or the only one to have done/achieved something (academic, professional, extracurricular), highlight this.
Hope this helps.
Manya - The Princeton Review