...then ‘select all’ & ‘copy’ to take away.

do you use this yourself?
no! i did once and it worked well, but i realized that the best trick is to create a new message in the mail app. it's less taps for every part -- 4 fewer to start (home-mail-new-loupe vs omg), 2 fewer to return (home-safari vs done-tabs-flip-choose), 3 fewer to continue (home-mail-loupe vs tabs-flip-choose-edit-scroll-loupe), about the same to finish (loupe-all-copy-cancel-choose vs loupe-all-copy-done-tabs-close) -- and way easier to scroll. truly next best to a multi-clipboard.

anyway. hey, why's the box so tall?
so you can see everything you've pasted, and about as much as you can paste "safely." isn't flick scrolling easier than that snails-with-anchors press-and-scroll thing?

can i really put in only 600 words?
you can paste as much as you want in here. 600 words (4K) is how much can be stored in a cookie. if you go over, this becomes an ordinary text box, without the magic auto-backup.

i just noticed that the counter doesn't change after i paste. why have a counter, to show off? because i'm not impressed.
apple chose not to have safari tell javascripts when the user cuts, copies, or pastes. if you type something, or press ‘done,’ or press ‘previous’ to visit the counter box, the counter will update. (when you're done visiting the counter, press ‘next’ to go back where you were in the pastebox.)

hey apple how hard would it be to add a multi-clipboard to the iphone interface?
about as hard as adding a history pop-up to the 'back' button on a web browser, right?