yes apple has a software update mechanism that updates all apple software products automatically
yes, photoshop, dreamweaver, and lots more apps are available. OSX is built on UNIX which allows lots of open source applications to be used. There is a lot of great freeware available and commercial shareware at that. I find generally mac apps are lower cost than PC equivalents. For example a great swiss army knife video converter called VisualHub is 23.00, helluva deal.
I would say a Macbook or Macbook Pro would do you just fine.
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