I liked it so I pitched in. Too lazy to make an account, though, so I put it in a gist [1].

[1] https://gist.github.com/anonymous/a22380f8c37b22dba03606e368...

EDIT: now that I think of it, Ctrl-R is really the killer app of bash/readline and it's saved me many more keystrokes than the word/line delete or cursor motion keys.