^L - center selected line (edit: center current line in window)
^E - move cursor to line end
^A - move cursor to the beginning of the line
^Y - yank (paste previously deleted text with ^K)
Corrections:
^B - move one character backwards
(^V is page down)
When I hit ^A in a text field of my webmail app (Fastmail) it reloads the page I'm typing in, losing all the text I've entered so far. You have no idea how hard it is for an emacs user to stop doing this. So be very careful on web pages.
I keep using kill-and-yank subconsciously because I'm trained in it. But the kill ring (is it even a ring?) gets preserved... idiosyncratically in Mac OS X, particularly when you move from app to app, and of course it is completely separate from the clipboard where copies and pastes go. I quite commonly kill something and then can't get it to yank, or kill something and then try to paste it and fail.
In firefox, the results are not too good. The tab dies, taking the entire textbox with it. Annoying.
The moral of the story is to not use software other than emacs. I use Gnus for mail and w3m for light web browsing, eliminating any problem with keybinding emulation. It is emacs, so it acts like emacs.
For heavier web browsing, I use conkeror. It is almost like emacs, but not quite. Better than anything else, though.
I still have bad memories floating around in my head from when I used Firefox, though.