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Check delicious popular tags like ‘useful,’ ‘tutorials,’ ‘tips,’ ‘howto,’ ‘advice,’ ‘entrepreneurship,’ etc. for interesting, educational articles to read.
Watch one of the thousands of educational videos streaming at TED.com,Academic Earth and Teacher Tube.
Read an online book list and find a new book to grab next time I’m at the library. Here’s another list. And another. And another.
Read a classic book online for free at Project Gutenberg, Planet eBook, or the E-books Directory.
Research a new Do It Yourself project at DIY Network, Instructables,eHow, or WikiHow.
Add to, delete from, or just generally sort my ongoing to-do list atRemember The Milk.
Create a cool graphical mind map of some of my recent ideas at bubbl.us.
Email a close friend or family member I haven’t spoken to in awhile.
Backup my recent photos, documents, and other important files online using Microsoft’s free 25 gig SkyDrive.
Use Wikipedia’s random article function to pick a random article to read.
Touch up on my math and science skills over a the Khan Academy, MIT OpenCourseWare, or LearningScience.org.
Send a paper greeting card directly to a friend or relative at enGreet.
Start learning a new language online for free at BBC Languages orLivemocha.
Watch one of the insightful 6 minute and 40 second presentations atIgnite Show.
Use Memorize Now to memorize a cool joke, or poem, or whatever.
Use Media Convert to convert video files I have on my computer into a format I can view on my iPhone or iPod later on.
Listen to an educational podcast over at Odeo or via iTunes on iTunes U.
Read one of the academic journals at the Directory of Open Access Journals.
Share my favorite mp3s, photos, videos, etc. with friends and family usingdrop.io.
Get a free college education online using this guide from Lifehacker (or read one of the other useful articles on Lifehacker).
Inspire and spark my creative mind by looking at a rolling slideshow of the highest rated photos on Flickr for the last 7 days.
Catch up on a short history lesson at HyperHistory or The Internet History Sourcebooks Project. Or find out what happened today in history.
Take a fun, educational online quiz at Quizlet.
Play an educational online game at Lumosity, Sporcle, Games for the Brain, or Math Run.
Add a little gentle rain to my environment using RainyMood.com and then simply meditate and relax in my computer chair for 10 minutes.
Sell old stuff I no longer need on eBay and make a little extra cash.
Find a new musical artist to listen to based on music I like at Grooveshark,Pandora, last.fm, or Deezer.
Find out what’s happening in our world from quality international news sources like BBC News and Reuters.