I’ve created a Greasemonkey script that will link the tickets in the changelog to the EE bugtracker.
For example, this page:
http://ellislab.com/expressionengine/user-guide/changelog.html#v213
Will contain links to the bugtracker, check out the attached screenshot if you have problems visualizing how this will look 😉
It makes it easier to follow up on fixed bugs etc.
You can install it from here:
http://userscripts.org/scripts/show/93760