How to find changes between 1.2.x and Edge

Is there somewhere which summarises the important changes between
Rails 1.2.x and Edge Rails?

It took me some digging around source code to discover that the URLs
for REST custom controllers have changed, from
    /foo/1;actionname
to
    /foo/1/actionname

If there's a summary of these sorts of changes, I'd very much like to
have a read through it.

Thanks,

Brian.

The trac:

http://dev.rubyonrails.org/

And there’s a blog that tracks noticeable changes to Edge:

http://www.ryandaigle.com/

Otherwise, there’s always CHANGELOG in each repository to read through.

Jason