One feature of OS X that I think not many Unix people know about is that it allows you to change keybindings system-wide (well, Cocoa-wide) by plonking the right file into ~/Library/KeyBindings.

I use http://beebo.org/fluff/macstuff/DefaultKeyBinding.dict to get a lot of the missing alt-key bindings as well as rebinding ctrl-a from "move to beginning of paragraph" to the more natural (to my fingers!) "move to beginning of line," etc.