fu wrote:
syb go for the 13 mbp, it's a decent laptop. maria loves hers and i get to use it every now and then. if it came with an expresscard slot i'd be all over it. thunderbolt may change the need for one tho
I am
almost 
sorry to tell you that I just ordered a thinkpad x61s complete with ultrabase. The speed is largely irrelevant, but it's much more solidly built and about the same size. The only potential neg with the thinkpads is that they run windows, which is not a problem for me (I would be doing all the same stuff with the mac regardless, just install cygwin for X11 and you are fine. You also get the ultrabase and a light. And a non-widescreen 4:3 display which is still ideal at this form factor (see ipad)
The big selling point for me is the price. I could buy eight or even ten thinkpad x61s outfits for the price of one MBA or MBP. It is also black and (this might be silly) so many other students, well over half it would seem though most run windows on them :/ , have those boring silver macbooks, it is nice to be different

Why upgrade from my x40? Well the battery only lasts for a few hours, it is stuck in windows XP sp2 land (sp3 seems to break power management, slow down sleep and undock, etc) and that isn't well supported anymore.
I did test drive both MBA and MBP models for a few days, as well as an imac (really not that quiet at all IMO

For me, having that nice OSX unix just doesn't justify the price. Yes, new thinkpads are also expensive, but they have a much better off-lease market

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