True, I have the entire series in my room..... Except for the First Strike (between Halo: CE and Halo 2) which I misplaced at school.
I have yet to see any troublesome plotholes. A non-Bungie Halo game is being developed: Halo Wars.
It depicts the wayward Spirit of Fire, and its struggles against the Covenant during the early years of the war.
At first I thought I'd read that the SPARTAN team aboard was Gray Team, but now I don't think so.
Anyway, if interested, just search for
http://halowars.com/ 