This issue has come up a number of times on the list, and every 
time someone says something like this:

> It's a good idea to avoid this if you possibly can. Once
> you've broken a policy that archives are just records of what
> people posted and are not edited, it's easy to get sucked into
> editing everything. People are _often_ embarrassed by what
> they said in the heat of the moment, and once they know that
> (a) it's there for anybody to see and (b) you can change it,
> well . . . 

Try searching the archives under "edit web posts." This view is 
not universally accepted, but the discussion's out there to be 
seen.

-- Russ

> I have been asked to delete a certain list message that was sent yesterday.
> How, if at all, can I do so, in the next couple of days (which I guess
> would be ideal) or perhaps after our weekly archive is generated?

St. Thomas University
http://www.stu.ca/~hunt/