> Also, the name might better be `blank-options-toggle' which is longer
> but less likely to be confused with the other toggle commands, such as
> `blank-mode'.
>   

Done, but the names now are blank-toggle-options and 
global-blank-toggle-options.

The docstring of these commands were improved (a little bit).

> A comment in the source for `defcustom blank-display-mappings' should
> explain why and when dollar sign was chosen.  You might say  
>
>     ;; 2007 Nov 15:  ?\u21B5 is better than a dollar sign at 
>     ;; ?\x24 or?$, but numerically it comes above #x0FFFF.
>     ;; Until Emacs unicode merging, such a downwards arrow is 
>     ;; displayed with the same face as surrounding text.
>   

Done, but a different text was added.

The new blank-mode version is attached in this email (still v7.1).