penders - 11:40 pm on Sep 9, 2010 (gmt 0)
And when I got to the posts, the boxes aren't checked for me to uncheck.
It seems that if you have checked the box on any one of your posts within that thread you will get notified (my last post on Aug 15 above is unchecked, but my earlier posts are - so I got notified). But you say you've never checked any boxes?! Hhmmm. Unfortunately it seems there is no easy way to manage your thread subscriptions yet?!