Well I spotted an "uninstall" link beneath thread titles in the mods area
That's always been there (but see below).
MOTM
Mods in the current motm vote will not be eligable for nomination for the next month - this is to prevent the same mods appearing month after month. Once the vote has finished, they can be nominated for the following month again - e.g. if Mod 'XX' is nominated in February, and appears in the March vote, it cannot be nominated during March (for Aprils vote). Once April is reached, it can be nominated again for Mays vote. You can nominate as many mods as you like during the month.
Modification thread listings
Where mods are listed as threads (like in searches, forum listings, list my installed hacks etc) the "Mark as Uninstalled" link has now been converted to use AJAX, so it won't redirect you into the thread anymore. Also, for any mods listed as "Updated" - you can click on the word "Updated" and it will update the database, meaning the mod is no longer listed as updated to you.
User Titles
The new points based system has being installed, with associated new titles. A members points take into account various factors involved with modifications (not just installs). A members points are not directly visible - in fact there are only three visible titles - Coder, Designer, and Coder/Designer. You only need one point to be a coder or designer (or 1 point of each for the joint title). Everyone will also have a "Release Level" based on their total points - the more points you have, the higher your release level - an indication of how much you have released (and how popular your work has become). Hovering over the user title will show what level people have reached.
Every coder/designer will also have an individual coder and designer release level, viewable by displaying the coder or designer list.
The rest of the changes were internal system and permission changes (so not visible), partly to tidy up old code and odd permission settings, and partly to add some things needed for later in the year.