This is one of the things Jef Raskin talks about in his book that I fundamentally disagree with. The canon cat would take a screenshot of the last thing you were looking at and shows you that while it takes 15 seconds to boot. I've never sat down at a computer and wanted to immediately look at the last thing I was working on, ever. Computers are for a lot of things.
While I'm at it, I never want a browser to remember the tabs I had open, or restore my tabs after a crash. Are you kidding me? The browser crashed because those tabs fucking suck. Get them out of my sight