Nyphur over at Massively has posted a helpful little article on EvE combat ideas. While the terminology and ideas in the article have been discussed plenty on the forums I think they do a very nice job of breaking it down to simple bits. The idea of angular velocity is the first topic and one I think every player should read about. Angular velocity is one of the more important factors in how your guns work and one of the reasons you can't hit an interceptor in a battleship. A solid understanding of this game mechanic can make a profound difference on your combat effectiveness and how you handle your ship in many cases.
I will try to post some more detailed information on combat mechanics in the coming days if time permits.
The Massively article can be found at: http://www.massively.com/2010/01/10/eve-evolved-five-interesting-combat-tactics/