The ability to generate passphrases

This has been suggested well over a year ago.

The most common method of creating passwords is using random numbers and letters but there is another method that is easier to remember, even when really long; a passphrase. A passphrase is either a random assortment of words of (as the name suggests) a phrase/sentence of some kind.

An example of a passphrase (I used this for my very first True Crypt partition nearly a decade ago):
theyretakingthehobbitstoisengard

That's a really easy password to remember and has the added benefit of being 39 characters long, making it absurdly hard to break.

The obvious way of implementing the first option (a random assortment of words) would be to take random words from a very large dictionary.
The probably not obvious way of doing option two would be to take a random string of words from a random website. I'm assuming your crawler caches webdata like everyone elses.

Suggested options: The ability to specify a word length, character length, random words, or an actual phrase of sorts.