Feel free to look at any of the plethora of past threads about this.

http://news.ycombinator.com/item?id=526517

http://news.ycombinator.com/item?id=200920

http://news.ycombinator.com/item?id=175186

http://news.ycombinator.com/item?id=344030

http://news.ycombinator.com/item?id=389692

http://news.ycombinator.com/item?id=198502

http://news.ycombinator.com/item?id=470128

Also, you might find the site http://searchyc.com/ useful for finding answers to these and other common questions.