I've had my PB for a good 2 years now and it has taken everything I have thrown at it. I use it pretty intensely with lots of Photoshop, video editing, media server, Office, and the basics (web browsing, Adium, Mail). Lately, it has been bogging down a little and during heavy use, it almost sounds like its defragging itself and then it bogs down. Lots of HD chatter. I am worried that the HD could be letting go. Should I just keep repairing permissions and other basic maintaince and wait for it to let go? Or should I just run out and grab a nice 100gb 7200RPM drive and do a swap? Thanks for the help.