Some Personality Tests (for fun or for insight):

http://www.keirsey.com (open Keirsey Temperment Sorter II)

http://www.humanmetrics.com (Identify your personality type [Jung Typology Test] and others) (thanks Huynh-Nhu)

http://www.16personalities.com (similar to Jung with a little Catell mixed in) (Thanks, Po'!)

https://www.outofservice.com/ (various personality tests including The Big Five - fun and a little bit of history behind them)