USCJ - The United Synagogue of Conservative Judiasm

About.com - Judaism Basics, with blogs

Hillel - largest Jewish campus organization in the world

Nativ ("path") - Live, Learn and Explore Israel

Jdate - Connect with Jewish Singles, locally or around the world.

Livnot U'Lehibanot ("To Build and be Built.") - premiere experience geared towards Jews 21-30+ with little or no background in Judaism

Jewish.com - dating, shopping, and distance learning links.

Jewish Youth Resources - a clearinghouse of youth related information