Name your top 10 favorite sites

We all have our favorites. And among the vast number of interesting and cool websites we may have come accross throughout are web browsing history, it's easy to forget a certain link you happen to like but there are still sites no matter what that we come to visit everytime. And this thread hopes to discover new interesting sites out there. You may exclude in your list big names like Google, Yahoo, MSN, CNN, Wikipedia, and the likes.

Just name your favorites sites that you highly recommends and thinks it might be interestingly useful for others too.