I was in a Camera House store today and noticed in their line up of white lenses that there is now a 70 - 200 IS !! When I bought mine (at least a couple of years back) there was no IS version for the F4, only for the F2.8 ! Oh I wish I could upgrade for free...
IS ... oh how I wish I had IS (not for astro, but for other stuff)... If there were a "drool" emoticon I'd use it here.
Roger.