General Internship Sites
CollegeGrad.com
CollegeMarketPlace.com 
Ferguson Career Guidance Center
internJobs.com
InternWeb.com
Internship Resources for College Students - Quintessential Careers
Internships-USA Click on "The Internship Series on line."
    (Email Career Center for username and password)
Internships.com (Email Career Center for login instructions)
InternshipPrograms.com
Internship Listings - Skidmore College 
Vault Career Insider  Access to Vault is for Undergraduate Students only.
    (Email Career Center for username and password)

Internships for Specific Interests & Geographical Locations
Employment Information - National Park Service
Idealist (global non-profits)
Internships/Jobs - Outdoor Adventure Professional Network
Internships & Jobs - Student Conservation Association
Internship Opportunities - NASA
DI Network  (Atlanta, Bay Area, Chicago, Denver, Houston, Los Angeles, New York, Philadelphia, Washington, DC)

Top Employers
Best Internships for 2010 - Forbes.com
Internships: The Best Places to Start - BusinessWeek
Top Intern Employers - CollegeGrad.com
Top Internships 2010 - Vault.com

Federal Government Internships
e-Scholar
How to Find and Apply for Federal Internships
students.gov - Scroll down to "Career Development"

Internship Tips & Housing
Internship Center - jobpostings
Internships/Co-ops - JobWeb
Internship Housing Opportunities 
DC Housing Guide

Seasonal & Summer Jobs
backdoorjobs
CampDepot.com
CampJobs.com
Camp Staff 
Care.com
Choice Camps
CoolWorks
Employment Information - National Park Service
Great Camp Jobs
Job Monkey.com
Jolt Camps
mySummerCamps.com
ResortJobs.com
SKIJOB1 - Vail Resorts
SnagAJob
South Carolina Summer Camps - SCIway.net
Summer Job Listings - Skidmore College
Summer Opportunties - Petersons
USAJOBS -  Summer Jobs in the Federal Government (Search using keyword "summer.")
YMCA Summer Camp Vacancy List

Overseas
GoinGlobal --Email Career Center for username and password.
International Internship Opportunities - University of California, Irvine
Internship Information, International Organizations - US Department of State
InternAbroad
Internships Abroad - Transitions Abroad

Overseas Visa & Placement Organizations
BUNAC
CEI Club des 4 Vents
InterExchange Working Abroad
USIT