At least a third of what made Halo such a great game was its original soundtrack, which combined good ol'rock'n'roll with synthesized orchestras and erie discordant notes to perfectly complement the action happening on screen.
The music is just as important to its sequel, but just as Halo 2 is has a certain over-the-top, Hollywoodish feel to it, so does its soundtrack. Indeed, where as the original soundtrack was focused entirely on the game's music, seven of the sequel's 21 tracks are music by popular artists "inspired by" the game.
I've spent a fair amount of time on Nuketown singing the praises of Audible.com, so I figure it's only proper that I also mention the drawbacks, most notably the fact that you can't use its files on conventional MP3 players.
A round of up of what's currently on my iPod, including the Halo 2 soundtrack, the New Age-meets-SciFi album Songs From Other Planets, as well as podcasts of Tech Chick Weekly, RPGMP3's The World's Largest Dungeon serial, and IT Conversations.
I never played Space: 1889, but when I saw this brief on 20by20room.com, I had to check it out. Basically, these are "full-cast audio adventures" record to CD and set in a world in which man went into space in the 1800 using the sort of "fantastic science" seen in the works of Arthur Conan Doyle, H.G. Wells and Jules Verne. Looks pretty cool. Read the full story.
My audio-starved commuter brain has been greedily drinking down podcasts for a few days now, and I've found - and continue to find - the entire phenomenon to be invigorating. I've also found quite a few podcasts worth listening to.