Yes, I wrote that (usually developers write name and contact details in default.py) and it's available through SVN Repo Installer from xbmc4xbox-addons repository, and I'll look at making it available through Addons4Xbox Installer as well.
https://code.google.com/p/xbmc4xbox-add ... Thumbnails
Glad to hear you found it useful, there used to be a thread for it in the old XBMC4Xbox forums, lost in the transition.