jQuery 1.2.5 released
jQuery 1.2.5 is available only after one day of jQuery's 1.2.4 release. jQuery 1.2.4 was a bad build probably. There were some patches missing and difference was small compared to the list of bugs fixed.
There is a huge bunch of tickets which is closed. Here is the list of tickets closed for jQuery 1.2.4 or 1.2.5. There were many browser compatibilities related issues and some are performance related and core improvements.
Click here to see the reason behind rebuilding 1.2.4 as 1.2.5