The big feature of this release is that timestamps now work, as well as CCK dates. Things like "node created time" and "node update time".
Furthermore, we now use date_custom2unix to read the value of CCK dates, and strtotime only if the date api is not available. This is because some platforms have a limited range in strtotime.
5.x-1.1 was critically broken due to a menu error. I didn't catch this on a test site because the only node it works properly with was node 1, which happened to be the one I was testing with. Sorry to everyone for the inconvenience! Thanks to christefano for catching this!