These are some sites I frequent, and some interesting finds:

iGoogle - The best tool on the internet. Extremely customized homepages, tabs, etc.
SitePoint - A comprehensive online compendium of web & coding.
Discovery Channel News - Always interesting.
ILoveTypography - A cool resource for all neat things typography.
Wikipedia - Not just an encyclopedia. Featured Articles, a daily Featured Picture & more.
National Public Radio - A great news source. I'm a listener as well.
TreeHugger - The best news & information about anything green. Great articles.
TheDailyShow - With Jon Stewart – always hilarious.
Change.gov - The President Elect's transition website.
Addictionary - A new website that inspires the creation of new words.
National Geographic - Great site for a great publication.
Lorem Ipsum - For mocking it up.
CSS Zen Garden - A monumental demonstration of Cascading Style Sheets.