I beg to differ. I made my current batch (about a pint) on 2/29/04, and it's still fine in the fridge. Almost used up, but fine. FWIW, I keep my fridge in the high 30s (F).
As with all condiments, keeping contaminants out is important for longer shelflife. Always use a clean spoon, don't let anything fall into it -- all the usual caveats.
If you do freeze it (nothing wrong with doing that), try putting it into small quantities -- the ice-cube tray trick, or a tablespoon or two in a snack bag.