Anime News Network
The Anime News Network provides information on upcoming anime as well as reviews and descriptions of anime. This is a great site for those whom have questions about their anime and what's happening anime-wise in Japan at the moment.
The One Piece Podcast
This website and adjoining podcast talk solely anout One Piece (excluding their side series 20 Minutes of Bull****). A great site if you're into One Piece. If you're planning to read all of One Piece, I suggest the Great One Piece Walkthrough while reading to have some questions answered.
Crunchyroll
Crunchyroll is a great place to watch anime. Watching is free, unless you want to sign up for a Premium Membership. They release episodes usually 1 hour after it airs in Japan with official english subtitles. Also by watching on Crunchyroll, you are supporting your favorite manga artists and animators.
FUNimation
FUNimation is the official supplier of dubbed anime in North America. You can watch episodes or buy DVD sets on the site. You can even join their forum (though you should join ours first), check the latests news or find conventions in your area.
Weekly Shonen Jump
Weekly Shonen Jump is the official way to read manga weekly in English the same day it comes out in Japan. It provides officially translated chapters to many countries including the United States, Canada, the UK, Ireland etc... You can also purchase manga volumes on their site. Be sure to check it out as it is the online provider of weekly official translated chapters.