General pre-med resources

The Application Essay - professional advice on building a strong essay.
MCAT preparation - MCAT review materials
Admission Success Getting into College, Graduate, or Professional School
Medically Inspired - A national non-profit dedicated to making the pre-med years as trouble-free as possible
The Medical School Admissions Process - outlines a successful approach to the medical school application process
The Application Timeline - a detailed timeline for applying to medical school
Medical School Finder - compare your MCAT scores and GPA to those of students accepted into medical school
Planning to get into medical school - important steps for getting into medical school

Application materials and official sites

AAMC - Applicant info and electronic application to medical schools
TMDSAS - Texas Medical and Dental School Application Service
OMSAS - Ontario Medical School Application Service

US Medical Schools - AAMC listing of schools and contact info
Data on Medical Schools - info on applicants, matriculants and graduates
School Rankings - from US News
Medical School Finder - compare your MCAT scores and GPA to those of students accepted into medical school
Caribbean Medical Schools - listing of Caribbean medical schools, the advantages and disadvantages of foreign medical schools

Other resources

Medical Mnemonics - a joyous site to help remember the things you know you'll forget
MedFools.com - Premed articles and advice for each step to medical school
College Confidential