Information / Reference  
About.com    Wide range of topics, overseen by experts.
Answers.com   Useful resource with over three million answers.
Britannica   Online encyclopedia with daily features and articles.
Dictionary.com      Free Dictionary     Thesaurus.com
Earth Google   Zoom in to a location anywhere in the world.
Project Gutenberg   Free online and out-of-print books.
NASA   News, amazing photos, and articles.  
National Geographic   Interesting articles and photos.
PBS.org    Public broadcast programming.
Science Daily   Source for the latest research news.
Scientific American   Various science news articles.
SI.edu   Explore the Smithsonian Institution.
Space   Amazing views, new discoveries, and education.
Technorati   Find some of the most popular blogs.
Wikipedia   Free encyclopedia anyone can edit. Daily features.

 How To and Projects 
Do It Yourself         eHow.com       How Stuff Works

 Useful Tools 
Del.icio.us   Social bookmarking all in one place. 
FreeTranslation   Approximate language translations. 
Local.Google   Produce a map for any address.
Skype    Long distance voice and video over the internet.

 Computing 
cNet   The best computer technology review site.
Download.com   Safe, spyware-free software downloads.
GRC   PC security and improve system maintenance.
Labs.Google   The place to check out Google's new ideas.
Lifehacker.com    Helpful hints and tips that will save you time.
PC Magazine    Articles, reviews, and anything to do with PCs.

 Electronics and Photography 
Engadget    News on the latest in electronic devices.
Picasa    Photo sharing site. Free uploads, free storage.
Flickr    Photo sharing site. Free uploads, free storage.
Gizmodo   The definitive gadget guide.
Pixresizer   Free image resizer for email and the web.
Popphoto   Web site for Popular Photography magazine.

 Blogging 
Blogger   Typepad   Wordpress    

 Games Online     
MiniClip     Pogo    Popcap    MSN Games     Yahoo Games