NOTE: If you are not a moderator, this script won't add anything for you. All it does is shows the user's timeline (which is publicly visible on their profile) on the moderator dashboard to make it easier for mods to see what users have done since a moderator last intervened.
Screenshot / Code Snippet
I recently suggested on Meta.SO that moderators have the ability to see problem users' recent activity through some sort of watch list. Fellow moderators expressed significant interest, and as a moderator on Super User, I know it would help me, so I went ahead and created the feature as a user script since it wasn't picked up by the SE team.
This script will add the ability to view the 10 most recent actions in any annotated user's timeline, exactly as it is displayed on their regular user profile. Just click the small arrow by a recently annotated user, and their recent activity will be displayed below. Click the arrow again to hide the timeline.
Tested on Super User, since that's the only site I'm a mod on. In theory, should work on any SE site. If it doesn't work on the site you moderate, let me know and I'll try to figure out why.
Tested in Firefox 4 w/ Greasemonkey and Chrome 11.
This script is released under a Creative Commons Attribution-NonCommercial-ShareAlike license. Basically, you're free to change and redistribute it for non-commercial purposes if you credit the author (myself).
The best way to provide feedback on this script is by adding answers or comments below. You can also contact me at the email address listed in my Stack Exchange profile.
Update Dec 19, 2011
Bug fix: new profile design deployed network-wide broke AJAX call. Fixed call to grab the right URL. Script is at the same URL, just reinstall it to fix.