Below, you’ll find a list of links to some excellent Pathology-related websites from professional organizations, to study cases, to blogs.  These are all sites that I’ve found useful over the past three years as a resident at Albany Medical Center, and, hopefully, they can be of use to you as well!
(Note: none of the following links are sponsored; I just like them.)

Obviously, this list is far from comprehensive, and if you have more links that you find useful, please post them as a comment below, as I’m sure we are all always looking for additional great online resources!

Organizations:

• College of American Pathologists
• United States and Canadian Academy of Pathology
• American Society for Clinical Pathology
• American Board of Pathology

Journals:

• Modern Pathology (included with USCAP membership)
• Archives of Pathology (included with CAP membership)
• Journal of Pathology Informatics
• PubMed (for completeness’ sake)

Helpful Websites (not exclusive):

• Pathology Outlines (Great for IHC Stains/CD Markers, also COW)
• Pathology Links (Good link farm)
• Hopkins Unknown Conference (Registration required, free membership)
• PathMax (Another Pathology link farm, many links are out of date now, however)
• UPMC CP COM (Check AP case of the month too)
• TraQ Program (Case studies)
• USCAP (Excellent site for AP educations material)
• ASCP Journal Online (Electronic access included with American Society of Clinical Pathology membership, free for residents, good articles for rounds presentations and board preparation)
• May Clinic Online Labs (Free, registration required. Check hot topics and management strategies videos.)
• Derm 101 (Registration required. Some free, some not. One of the better derm sites)
• PathConsultDDx (Good site for differential)
• U of Utah (Gross images and tutorials)
• California Tumor Registry (Super anatomical pathology case of the month)
• Lab CE (MCQs for CP)
• Kansas State U Parasitology (Good tutorial for parasites)
• Cytology Stuff (for cytology study)
• UT Houston Coag Studies (cases for study coagulation)

Books with online resources (require purchase/registration):

• Sternberg’s Diagnostic Surgical Pathology
• Robbins Pathologic Basis of Disease
• Weedon (Dermatopathology):
• Rosen’s Breast Pathology
• Diagnostic Pathology: Genitourinary
• Gastrointestinal Pathology
• Flow Cytometry and IHC for Hematologic Neoplasms
• AFIP Fascicles