facebook!
Compare the site to at least two other good sites, then see if Wikipedia has the same information and facts. If it does, the site's reliable. If Wikipedia disagrees with the information on that site, Wikipedia's lying, and the site is reliable.
It's not a bad site - it can be a good source of information and knowledge.
You can search for reviews, check if the site has a good reputation, and verify information from multiple sources if possible
wikipedia.org
Answers.com
Good free site for geneology is worldgenweb.org, which contains expert information regarding genealogical and historical records.
I found this site which has a good combination of information and a job search engine. http://hairdressersuccess.com/hairdresserjobs.html
www.wikipedia.org
To find out more information about state and federal tax filings, you should check out the IRS site and search for the information that you need. They have a lot of information that will help you on their site.
The sparknotes site has nothing good and you shouldn't use it for any research. I recommend the site www.sparknotes.com because its a good site with lots of information