With a long delay after GNOME 2.16 release, API-compatible gswitchit-plugins are out. No functional changes are made - just API update.

Feel free to download from either sf.net:

http://prdownloads.sourceforge.net/gswitchit/gswitchit_plugins-0.6.tar.gz?download

or GNOME CVS (using the tag v_0_6).