Today let me introduce my favorite websites.
Very good sites that I know are Dictionary.com, Google adsense, and Buy.com

Dictionary.com http://dictionary.reference.com/

This website is very useful for students. Of course you can find the meaning of an English word with this site; furthermore, you can find many synonyms and antonyms very easily. Wait! Dictionary.com still has more functions than you expect. It has not only dictionary functions but also encyclopedia and reference functions. Because all of them can be used free, you can have mini-library!

How to use: put the word you want to figure out into the box at the right corner!

Google adsense http://www.google.com/adsense

Do you have your own website or blog? If you have, this site is very beneficial for you. In order to use this site, you need to register and make your account. After you register, you can attach some advertisement on your website or blog. The advertisements should be related your website’s contents automatically. All advertisements are provided by Google, so it is very safe. Once someone visit your website and click advertisement, you will be given some money from Google. Although the money per one click is very low, it is free to start and maintain. Therefore, if you have website or blog, why don’t you try it?

Caution: DO NOT try it for school-assignment or company’s blog. USE your private one.

Buy.com http://www.buy.com/

In this website, you can buy many goods, especially DVD, CD, and Books. It is like Amazon, but you can buy some goods in cheaper prices than Amazon. In addition to DVD, CD, and Books, Buy.com has many merchandised such as electronics, bags, toys, indoor and outdoor goods, and even cell phones. Therefore, when you are looking for some stuff, visit not only Amazon but also Buy.com!

Caution: Only English is used in Buy.com

Thank you for reading, and try them if you are interested in!