So what does all of this mean to the average XboxLIVE gamer? Not much. What does this mean to the addicted XboxLIVE gamer? Everything. Imagine, if you will, that I was playing PGR2 last night and I simply couldn't beat "MirthMaker03". I add him to my Friend's List and today, when he signs on, my cell phone rings. I instantly see that he is back out there, needing to be defeated, and so I quickly sign on to XboxLIVE and annihilate him.
Also, for those of you who are addicted to IMing, this means that the various friends that you've made on XboxLIVE can now easily be found while online on your computer.
I think Microsoft's goal with all of this integration is to create a feeling of "community" surrounding XboxLIVE. Not that this hasn't already been done in a limited capacity via voice chats on XboxLIVE itself and general online gaming, but bringing it out of the console and onto the computer somehow makes it more real. All of a sudden "MirthMaker03" isn't just a really good driver, he's a 34 year old IT guy sneaking onto MSN Messenger while at work at a company in Utah.
There will be more and more integration such as this over the next few years. What with market research being done on an Xbox that also plays PC games and Microsoft's overall goal of having the Xbox become the central unit in your home entertainment center the future will be interesting and many lines will be blurred.