I am happy to hear you like the simplicity of ToffeeLinks :). I like it too :).
I am using it myself for my own websites.
I think about setting up some small charges at some point, but not before the number of merchants reaches 100. And even then I want these charges to be the smallest on the market (for such a hosted solution).
Until then it is all free.
I am developing new features (working on chart reports now, goals and sources analytics then).
ToffeeLinks is meant to be a problem-free, hosted solution. I have built it in Google App Engine (hosted on Google infrastructure). There is no ready-to-install software pack, I'm afraid.
Let me know if you have any trouble setting up the system for your website. I'll help in case of problems.