Macbook Air (Oct 2010) Photoshop & Web development laptop?
A similar question was asked over at Programmers.SE, though it was about iOS development. Some might say that's not the same thing, but Photoshop is a robust application that allows you to install some very heavy-duty plug-ins and it has some of its own as well. The consensus could be gotten from the top two answers (mine, which has the higher vote count, and the other which was accepted):

Mine with 5 votes:


  ...leaving aside price, I would
  recommend a MacBook Pro for any
  serious development work instead. A
  MacBook Pro is more easily upgradeable
  to suit needs than an Air (if it is
  even upgradeable at all). The Air
  seems more targeted to lighter-weight
  uses.


Accepted with 4 votes:


  It's obviously not going to be the
  fastest machine but it's perfectly
  suitable.
  
  I'd say the 13" over the 11" because
  reasonable screen size is a big deal
  for development, and it can go up to
  4Gb RAM rather than 2Gb (absolutely go
  for the 4Gb RAM model on day one and
  if you can afford it the faster
  processor as I suspect upgrading later
  isn't something Apple will be
  pushing).
  
  Yes it's got limitations (basically
  the same as any laptop - essentially
  screen and power are limited next to a
  desktop) but I have the new one and
  it's entirely workable and I know
  others who use them (and used the old
  MacBook Air) day to day with no
  problems.


I, personally, still wouldn't recommend the MBA for any type of development work, web or otherwise. I've yet to do anything developing for iOS that causes me to bog down my machine the way Photoshop can and will.