What is the difference between 1.5.1 and 1.4.0? ...
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What is the difference between 1.5.1 and 1.4.0? What do you mean developer release?
The 1.4.x series was released in 2004 and represented a stable release series. The 1.5.0 release was made in early 2005 but several annoying bugs were included in it. The 1.5.1 release in October has fixed those bugs and also added a number of new modules as well. See the Changes file for more information.
Developer releases are odd numbered releases (1.3, 1.5, etc) not intended to be completely stable (although all tests should pass). Stable releases are even numbered (1.0, 1.2, 1.6) and intended to provide a stable API so that modules will continue to respect the API throught a stable release series. We cannot guarantee that APIs are stable between releases (i.e. 1.6 may not be completely compatible with scripts written for 1.4), but we endeavor to keep the API stable so that upgrading is easy.
(historical text from old FAQ)
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