As a former Amiga user, I've long been a fan of full screen apps. This is also an area where Windows and Linux have outshined Mac with its not-really-even-a-maximize-button user interface. So this new plan full screen apps plan for Lion is really interesting to me.
Sadly, I fear the Mac App Store is just the first step toward completely eliminating traditional application distribution on the Mac. We'll see where they are in 10 years.
On a side note, I do still need to pardon Apple since they removed the draconian anti-Flash clause for iPhone app development. Can't ignore them, though. They'll likely be back at things along those lines (or other troubles of similar magnitude) before too long.