I, too, keep my shoes on, and my glasses if I'm wearing them, until a few minutes after takeoff, but I've always seen this as more of a "this way I can get the heck outta here and see where I'm going if we have a survivable crash." I also look over the safety information card before takeoff (unless I am SOOOOO tired I just fall asleep); but again, this is more of a safety thing than superstition. There are a lot of different configurations of exit doors, and figuring out which one you have and how to operate it while outrunning flames is not my idea of a good time... And in that vein, I suppose I also make a mental note of the closest exits and how to get there; then how to get there if the plane was upside down. I mean, all of this takes about 15 seconds as I'm getting myself comfortable... I figure I wouldn't be able to live with myself if I survived a crash only to burn or die of smoke inhalation because I couldn't figure out how to get out.

The only thing I do that I would consider "superstitious ritual" is that I pat a kiss on the outside of the plane as I'm boarding (that is, I kiss my hand and then pat the outside of the plane with that hand). You wouldn't even notice it if you weren't really paying attention; you'd probably think I was steadying myself as I stepped onto the plane...