Version 1.2.5 in itself is nothing big, just a few fixes. This version however is the first release to be released as a standalone and not just as a Joomla module.
I stopped using Joomla quite a while ago myself so it's been a while since I actually did the conversion of LeoClock to a standalone script, just didn't get around to releasing it for some reason.
1.2.5 also marks the last release to ever be done for Joomla 1.5. I'm not sure if there will be any future versions of LeoClock, it already does all I ever wanted it to, but if there ever is a new version it'll only be for Joomla 2.5 and up and as standalone. Just putting it out there.