I'm trying desperately to get to grips with the differences between the MBP and MBA that are beyond the physical (dimensions etc.) and one major difference is obviously between the normal hard-drive of the MBP and the SSD of the MBA. On first glance I made the assumption of oh the MBA has a smaller hard-drive which, is true, but does having SSD mean that apps run faster? i.e. youre actually making a trade-off in terms of increased performance (for lower capacity?) Usually I just run iPhoto, Safari, iTunes, although these are sluggish on my old white 2007 MacBook. But then I hear people saying that having Core i5 etc. is pointless if youre not doing intensive video work (etc.) on your machine so maybe these apps would just run at a fairly similar speed on a new machine?