I found a productivity app for you to try Pete;
http://www.appbrain.com/app/pomodroido/net.artifix.pomodroido.free
It's pretty good.
I don't tend to stop immediately after a podomoro finishes if I'm on with a task. Rather I find for me it carves up time into chunks that I'm motivated to fill.
Not really read much around it but I've found it very useful.