In .LRN forum, the last 11 posts before "New version of the .LRN IMS-LD 1.1.0 tagged and released" post (from ".LRN Leadership Team 2006/2007" to "LAMS2 and .LRN integration (beta) released") had been
updated in RSS as new with the last post date (I think) Sep 12, 2007. Maybe there was a software update in that moment... or something that could trigger an update of "dates".
After that, there had been another post today, but only changes the post date (as expected).
PS: I use Google Reader.