The internet is a resource that will provide premedical students with much of the information they need to prepare for applying to medical, dental and veterinary schools.  A few such resources are listed below.

Association of American Medical Colleges
Information on the MCAT, and applying to AMCAS schools 

The Princeton Review
A useful resource with a focus on admittance 

Index of Yahoo! Registered Medical School
A compendium of post-premedical destinations.