Version: (using KDE 4.3.0) OS: Linux Installed from: Ubuntu Packages Disclaimer: I tweaked the Ubuntu source debs so that they would also build the google gadget scriptengine, so although I'm using the Ubuntu packages, they're not official. The problem is, when downloading google gadgets, they wouldn't show up in the list of available widgets. After poking around in ~/.kde, and comparing .desktop files, I found out that adding "ServiceTypes=Plasma/Applet" to the *ggl*.desktop files would have them appear in the list.
just looked and this is added here on kde 4.3.2. i have ~/.kde4/share/kde4/services/plasma-applet-ggl_2.desktop and $ grep ServiceTypes ~/.kde4/share/kde4/services/plasma-applet-ggl_2.desktop X-KDE-ServiceTypes=Plasma/Applet,Plasma/Containment
closing as this is working as expected