This is how i installed Google Gadge on Ubuntu Heron. Hope it helps.

* Go to terminal (Alt + f2 ; gnome-terminal)
* Install the following
> sudo apt-get install libcurl3 libcurl3-dbg libcurl3-gnutls libcurl4-openssl-dev libcurl-ocaml libmozjs0d libmozjs0d-dbg libmozjs-dev spidermonkey-bin g++-4.1 g++-4.1-multilib g++-4.2 g++-4.2-multilib

* Create a symbolic link
> sudo ln -s /usr/bin/g++-4.2 /usr/bin/g++

* Download and extract Google Gadget
> wget http://google-gadgets-for-linux.googlecode.com/files/google-gadgets-for-linux-0.9.1.tar.gz
> tar -xvzf google-gadgets-for-linux-0.9.1.tar.gz

* Build Google Gadget
> cd google-gadgets-for-linux-0.9.1/
> sudo ./configure
> sudo make
> sudo make check (must have 0 failure)
> sudo make install

** the following steps is what make it work on my computer, it might not work on your so i held no responsibility on what ever might happen on your computer.
> sudo cp -rf /usr/local/lib/ /usr/lib; (not good to execute this)
> cd /usr/local/lib
> ls google-gadgets libggadget-1.0.so.0.0.0 libggadget-dbus-1.0.so.0.0.0 libggadget-gtk-1.0.so.0.0.0 libltdl.so.3.1.5 libggadget-1.0.a libggadget-dbus-1.0.a libggadget-gtk-1.0.a libltdl.a ocaml libggadget-1.0.la libggadget-dbus-1.0.la libggadget-gtk-1.0.la libltdl.la pkgconfig libggadget-1.0.so libggadget-dbus-1.0.so libggadget-gtk-1.0.so libltdl.so python2.4 libggadget-1.0.so.0 libggadget-dbus-1.0.so.0 libggadget-gtk-1.0.so.0 libltdl.so.3 python2.5
> cd ../bin
> ls affinity-preferences et etded ggl-gtk
> export LD_LIBRARY_PATH=/usr/local/lib
exit terminal

* run google gadge
alt + f2
ggl-gtk

Add to google gadget as widget to Compiz Fusion
Go to Compiz settings
-> Widget
-> Behaviour Tab
-> On windows Window type class=Ggl-gtk
Close Compiz settings

I still have a problem, i dont seems to have a browser associated with it i always have
ReferenceError: browser is not defined
Thanks in advance

and another problem is that i always die.