that doesn't solve the problem that I (and I assume others) habitually press the back button when I'm done perusing comments in order to get to the main page. At this point when I press the back button it goes to a slightly older version of the comments page- and various other oddities.
I run into this problem all the time--not good for diminishing by reload-addiction! It would be nice if pages included some js to rewrite history via dom, so that we could always see the freshest versions of pages.
 It pains me to advocate breaking the "show me exactly what I was just seeing" semantics of the back button, but I think in this case the user clearly conceives the back button as "show me the abstract resource I was just seeing."