Fist of all , what this plugin is all about ??
It just displays the current mouse/cursor position a little more eyecandy.
Lets take a look :
Nice !!! what to do now ??
Just continue reading .. ;)
i use ubuntu hardy alpha 4 and i already have installed master git
here is how i installed mousepoll and showmouse plugin:
1) run “Alt+F2” and type “gksudo gnome-terminal”
this will open gnome-terminal with superuser priviledges
2) type :
mkdir compiz_plugins
cd compiz_plugins
3) clone both plugins through git :
git clone git://anongit.compiz-fusion.org/fusion/plugins/mousepoll mousepoll
git clone git://anongit.compiz-fusion.org/fusion/plugins/showmouse showmouse
4 )
cd mousepoll
make
BUILD_GLOBAL=true make install
cd ..
5)
cd showmouse
make
BUILD_GLOBAL=true make install
done 
i hope this helps you
Important : you need master git for both plugins to work !!
Master git is the latest version of compiz.
If you are looking for a way to install compiz fusion from git take a look at this (look at Makefusion script)
Note : if you are going to use makefusion script to install compiz then you don’t need this , as both plugins are already in plugins-extra category
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