Well, the good thing with http://codex.wordpress.org/Changelog/1.5.1 is that it listed all the modified files.
I originally posted on the "Installation" forum, not in the Hacking one. I don't really want to know WHAT has changed, but only get a list of all files modified like it was done for 1.5.1, which is enough information for those who asks this type of question... I just need to update the modified files, I don't need to know what they updated, I rely on them for this.
And so far none of the posts I searched for reply to this question (I admit I only looked at the first 5 results).
I'm not a developper.
I'm a regular user with a minor in hacking.
I just thought and pointed out that it would be a good practice if developpers could be more verbose about the changes, and express them in a non technician language intended for the masses (like me), like the one used for http://codex.wordpress.org/Changelog/1.5.1
And that would be awesome if we could get a place to read those changes. Specifically, that would be awesome the developers could CREATE :
http://codex.wordpress.org/Changelog/1.5.1.1
http://codex.wordpress.org/Changelog/1.5.1.2
But thanks to you Viper007Bond I can know start my standing ovation for Ryan for providing this : http://wordpress.org/support/topic/34263#post-194075 which is a good start.