Here's links to a bunch of websites I found useful or interesting.

Wikipedia - Everyone who hasn't visited this site before needs to. I visit it almost on a daily basis.
Newegg - If you live in the U.S. and you're looking for computer parts, give them a try.
NGEmu - Excellent emulation website. It has downloads for emulators for consoles and handhelds made in the last 10 years, and the forum members can help you with almost any emulator.
GameFAQs - Go here if you're stuck in a game or are trying to get 100% completion. They also have a decent selection of save files for some games.
the show with zefrank - Very funny video blog, that often makes me think as well. Definitely worth a watch, although plan on spending a lot of time to watch 100+ videos if you get hooked.