I took the mac plunge this past week and so far I'm loving OS X. I would eventually like to upgrade the stock 250gb to a 640gb, and install the kingston 40gb ssd drive into an optibay as the dedicated boot/app drive. First, for a dual ssd/hdd system, putting the ssd in the optibay is the correct strategy right? What is the best way to attempt this switch? If I replace both drives at once, I'm screwed because I need the optical drive to install os x, correct? So should I install a OS onto the 640 first, and then install the ssd? I'm also relatively new to time machine, so I'm not sure what its capabilities are--will i be able to only back up my applications? In the end, I'd like to be able to boot from the ssd and store videos/pics/etc in the HD. Thanks for any help.