www.dictionary.com
for when you forget a word, or just desire expansion of your lexicon
http://garfieldminusgarfield.net/
my other favorite web comic, next to the previously mentioned xkcd. It's a depressing yet humourous look at the world of garfield, minus the presence of all characters but john arbuckle.
http://www.craigslist.org/
for if you need to sell some piece of crap, buy a piece of crap, or observe the everyday musings of completely inept people.