I've had my Macbook Pro since July 2006, so it's pretty old, I guess. It's served me well until recently...it's just gotten REALLY slow, freezes all the time, and my third battery is now completely dead. I have lots of empty space on my hard drive, so I don't know why it's so slow...is it just age? Anything I can do to speed it up? Or is it time for me to cave and get a new one? If so, can you point me to any tips on the new Macbook vs. Macbook Pro?