Much to my wife's glee, I just finished Halo 2.  This game seemed much more epic and cinematic than the original.  Whatever you do, keep watching AFTER the credits.  Without spoilers, what surprised me the most were some of the names in the credits, particularly Ron Perlman, and Orlando Jones.  You didn't see any airtime on the fact that both lended their voices.  I wonder, were they just Halo fans who wanted to be a part of the new installment? 

A friend of mine, let's call him “CP” works on the Bungie team.  Back when he first started, I was able to beat him in the original.  After an evening of H2 the other night, it's clear that he has bested me many times over.  Time to practice I guess. :)