This is J.K. Rowling's official page. Everything in it is written by her and she updates it whenever she can. Everything found here is true concerning anything to do with her or Harry Potter.
www.mugglenet.com
In this you can find information on anything to do with Harry Potter and anything related. There is a section exclusively dedicated to J.K. Rowling including her biography, photograaphs, interviews and more. It can be found here
www.the-leaky-cauldron.org
This site is dedicated to anything related to Harry Potter and also includes many things to do with J.K. Rowling. These facts including biography and interviews can be found here
www.quick-quote-quill.org
This website specializes in interviews done by Rowling throughout the last few years.