I second AllRecipes.com!!! I love that site!!!!!! I've made many fabulous meals from there that were quick and simple and tasted soooooo good
I also like to go to some other forums that are specific to me like Glider Central (sugar gliders), scrapbooking and other arts & crafts...
Pogo.com has fun games...
I like to visit Amazon.com to read up on things like books that I want to get some day (my wishlist is like 7 pages long!)
I also check these two every day: http://www.fadedyouth.blogspot.com/
Another cool thing that is great for wasting time... You have to have Mozilla Firefox which you can get here: http://www.mozilla.com/firefox/central/
but they have extensions you can download and my favorite is called "Stumble". To set it up you just click on the items that interest you off of a big list then when you are bored you just click the "Stumble" button in your browser window & it will pull up a random website. I've found some really really cool sites this way! Bonus- Firefox is way cooler than all the other browsers- you can have different web pages as a tab in one window rather than opening new browswer windows for each site!