How to determine what face is associated with a bit of text?

[Stephen J. Turnbull]

skip at pobox.com writes:
 > 
 >     Stephen> That's the main thing.  Now that people are showing interest, I
 >     Stephen> have some incentive to work on the following 5 bugs.  
 > 
 > I'm a casual enough user that if something's not in the (pre-released) set
 > of packages I'm unlikely to use it.  I guess that's my way of asking you to
 > bundle it up for inclusion.

Is there anything that you'd like to be able to find out by pointing
and clicking on buffer text?  (At present this will work only on stuff
in a buffer.)  May as well add as much useful functionality as
possible while I'm at it.