First off I would like to say that this was my first apple computer and I absolutely LOVE my MBP, I have been completely happy with the purchase. As of recently my MBP has been cutting off when the battery reaches ~40% so I have to plug it back in and the batter will start recharging from ~40%. Why is this happening? What should/can I do? Last week it worked perfectly. Also, I only have about 12.5 GB's left of my ~150 GB HD. I know that I have about 40 GB's of music, a few movies and a few documents. I do not have many programs installed (firefox, transmission, adium, unrarx, maybe a few others). What can I do to possibly clean up some stuff and free up memory? Am i completely deleting programs/files by dragging them to the trashcan and emptying it? Should I get an external HD or replace my current HD with a larger one, if so what specs do I need to have? I apologize for all of the questions, I am not the best with computers beyond basic operating. Any help would be great! Thanks!