gnome-shell-extensions-hamster. But I can't see how to actually use it efficiently. It looks like this:
How can I start tracking time for a specific project from this "applet"?
I don't know what it looks like on Gnome 3. What version are you using, with what Ubuntu version?
On Ubuntu Maverick, I've installed the latest version from git.
When I left-click on the applet in the panel, the applet looks like this:
It is a simple matter of entering the project name or whatever other name I want to provide, adding a possible tag, and hitting "enter". It then starts adding to my time for that project. I can see reports, etc, by doing a right-click on the applet in the panel, run reporting tools, export data in html, iCal, xml, python, etc.
In your case it looks like you just need to type in the project name and hit enter. Thay may be enough for you to track your time, and then use the stand-alone GUI for reporting etc. Again I'm not sure what else is different in the Gnome 3 GUI, or what exactly you're looking for, but the Project Hamster site has lots more info, and several ways to provide input or bug reports.
Found an integration with the app-indicator in the bottom of the screen with instructions at http://www.webupd8.org/2011/07/install-hamster-indicator-time-tracking.html
The Gnome shell integration is still lacking in Hamtster
there is 1 other project working on this at github that seems to be a bit further along than the official package
For official updates you can always follow the official blog at http://projecthamster.wordpress.com
So unfortunately there isn't a clean integration yet -- I've found that running the program as a stand alone works rather well - the default location is
Press Alt+F2 and paste that line in - should pop right up as a stand alone window