Out of the ones you suggested: Spacebar I use the most out of those three. W second because I always use URLs. Then I guess backspace, even though I'm a really good typist, I don't usually need to use it. But as far as ones that I actually use alot, from the looks of my keyboard: spacebar, e, r, t, y, f, h, j, and k are starting to get scratched off.
I never type "www.", complete waste of time for me. what about enter, do people really take the effort to move the mouse to click the search/go button, when they can just hit enter? lol it may not seem like much but it seems important for me to do the task in as few keystrokes as possible.
agreed. W is used if your a gamer MUCH more then any other letter. However im weird, i use arrow keys with Enter+Shift+ctrl+Num0+End+PgDn+\ keys. I think thats just IE and Firefox. Some people dont use windows (Safari)
I think most computer users use it for instant messengers, emails, browsing, and office work all but browsing need the space bar, so im gonna go for that
Probably "X" in my case, I type that consecutively three times most days into popular searches. ...but seriously, probably the space bar.
the E its the most used letter in our language, and of all the computers I had that was the first letter to fade away