I recently had to purchase a new MBA after owning a 2007 MacBook. I liked the old laptop mostly because I had a 500GB HD in there that could take care of all my high-resolution photographs and music. Sadly, my new MBA is limited to 128GB. So, for those of you who were in a similar situation, what are your best storage tips and/or techniques for keeping these big hard drive hogs nearby but not on your MBA's SSD?