I have just published a little app on Chum: Install History.
It’s a viewer for the Zypper
/var/log/zypp/history, i.e. it displays the times when packages were installed and uninstalled. Nothing terribly interesting, but as zypper/packagekit sometimes install more than is immediately obvious – especially when you have third-party repos enabled – it may give some insight where packages come from.
After installing, it will show up in the Settings app.
Source code is here, contributions welcome (esp. the search function would benefit from some improvements)! Also interested in whether it works on SFOS < 4, as I’m not sure there is a zypper log, or if its in the same location.