First of all I'm waiting for the new 15" PB to land on my doorstep. Can't see it coming soon as it's still in China waiting for a flight! Anyway, I'm now considering getting an iMac G5 20". I am going to be a switcher. The PB is the first thing to replace my stunted Compaq tablet PC . The iMac will replace my Compaq Evo desktop. I have looked at the support pages on the Apple website about changing internal items if they need to be replaced. They are: - AirPort Extreme Card - Memory - DDR 400 MHz (PC3200) SDRAM - Hard drive - Optical drive - Power supply - LCD display - Mid-plane assembly My question is if Apple bump the spec to include DVD+/- writers could I change it myself? Or am I stuck with what I've got? I need the machine now so I'm not going to play the waiting game, I just need a little reassurance that things like optical drives can be changed out for new models, not just a like for like replacement if they go down. Does anyone know if the Bluetooth module can be changed or added at a later date?