Hmm...well if you haven't played Halo 2 I'm not sure that I should reveal the storyline...
...it is being released (Halo 2) on Windows Vista ONLY for PC.
(Microsoft is forcing users to buy Vista for Halo 2...GRR!
)
But (without too many spoilers) heres a VERY basic synopsis...
Halo 1 took place on ALPHA Halo - which was indeed destroyed.
Halo 2 starts on Earth - then moves on to DELTA Halo (yes, there's more than one...)
Also you find out the purpose of the Halo (actually, this was told to the player in Halo 1 - but it's expanded on in the second game to make more sense)
Halo 3 Picks up the storyline at the end of the second game...where...(okay if I go any further I will write too many spoilers...so enough!)
If you haven't played through Halo 2 - and your neighbour has a XBOX 360 (and Halo 2). Then go and play it on his big screen telly!
You WILL be impressed (it looks a lot better in hi-def on the X360 than on the original XBOX) 8)
Anyhow, enjoy the trailer folks!