The short of it, when I purchased my MB in 2008, I didn't think that it would be used for much more than basic web browsing, word processing, and iTunes. Therefore, my 120 GB HD would suffice. But as the years have gone by, and with my recent ATV2 purchase, the space has filled up to the point where I'm down to about 15 GB. So I would like to be able to replace my HD to something more suitable. As someone who's never done this before, I was wondering if anyone could guide me through the general process of doing this, and what type of HD I would need to replace it with? Thanks!