CHANGES
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+ Introduced tabs. First, we extended the menu system to support tabs. Next, a tab was added for every link that was (1) an administrative action other than the implicit 'view' (2) relevant to that particular page only. This is illustrated by the fact that all tabs are verbs and that clicking a page's tab leads you to a subpage of that page.
+ Flattened the administration menu. The tabs helped simplify the navigation menu as I could separate 'actions' from 'navigation'. In addition, I removed the 'administer > configuration'-menu, renamed 'blocks' to 'sidebars' which I hope is a bit more descriptive, and made a couple more changes. Earlier, we already renamed 'taxonomy' to 'categorization' and we move 'statistics' under 'logs'.
+ Grouped settings. All settings have been grouped under 'administer > settings'.
TODO
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+ Update core themes: only Xtemplate default supports tabs and even those look ugly. Need help.
+ Update contributed modules. The menu() hook changed drastically. Updating your code adhere the new menu() function should be 90% of the work. Moreover, ensure that your modue's admin links are still valid and that URLs to node get updated to the new scheme ('node/view/x' -> 'node/x').
administrators will be able to define a custom 403 page, just as they
can define 404 pages now.
This needs to be documented in the "Changes since / migrating to ..."
pages.
configurable! Menu items can be disabled, repositioned, added and
so on.
Upgrading to requires you to run update.php.
This functionality depricates some of the 'navigation modules' in the
contributions repository. Furthermore, modules can now 'suggest'
menu items and site adminstrators can choose to enable them. Modules
in the contributions repository should try to take advantage of this.
expected) and gives proper class names to the long and short tip list, so if
someone would like to reproduce the 'br' tagged version, he can do that with
some CSS styles easily. Assigned a dedicated class to the more-tips link, so it
can be differently stlyed (with a different bullet, different link color or
anyhow, as the theme designer desires).
+ Added drupal_http_request().
+ Replaced rssfeeds with OPML feed subscription list.
+ Added support for pubDate.
+ Added support for conditional gets using ETag and Last-Modified.
To do this cleanly, I reorganised some bits of system.module: there is now a generic handler available for simple variable-get/set based configuration pages. Look at filter_admin() or system_view() for example usage.
(based on the patch by Goba)