That is a fabulous idea.
And I received a letter the other day, which hadn't had the stamp franked. Plus it was a 1st Class Large one.
(heh! Chortle chortle!)
So I have steamed this off, and am saving it so that when the one paper copy lands on my door mat, I can post it on for free.
And not increase my carbon footprint reading online... 
cheers
a
In this day and age of PC and HSAW this sort of activity is obviously bordering on the illegal!
Licking previously licked stamps has all sorts of hazards associated with it, just imagine, Boyd may have licked it!, or worse.....GC!.....the correct proceedure to adopt is to wear a pair of those latex gloves (must have them by the shedload at your workplace Andy) and some protective eyewear (also available at Andy's workplace, I'm using the term WORK somewhat loosely here) then, obtain a PritStick ( obtain this prior to donning gloves and goggles....don't want to appear any more of a wierdo than you already are when you shuffle round Smiths looking for the glue section)
apply pritstick to reverse of stamp and fix to envelope.......dispose of pritstick safely (to avoid cross infection during second use), remove protective gear (unless you have some other immediate pervy use for them)....proceed in an orderly manner to post office (on a non strike day) and post worn out TC newsletter to Boyd.....who....not realising a pritstick has been used (and assuming the stamp has again not been franked) will get a horrible taste in his mouth when trying to reuse.
yes, it's raining outside, yes i'm bored, yes i'm wasting my time typing drivel on the TC forum. pip pip