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I've used Smarty in a little project of my own.
It started out as a personal calendar script complete with user authentication etc. but I brought in more and more items from XOOPS when I built on top of it to accomodate my needs for my company's website (
http://www.web-udvikling.dk)
The result I call CompanyWeb, but might as well be called XoopsLite
since it uses a modified phpmailer taken from XOOPS (where it was in turn taken from an OS script) as well as the whole block structure and XoopsForm classes.
With some very minor changes, XOOPS themes work with CompanyWeb.
During the process, I learned a lot about how Smarty works and what you can do about it - and I haven't even gone into saving templates in the database yet.
Great work Kazu & Co. on getting Smarty so much into XOOPS that it is so seamlessly integrated that people may even think that Smarty is a part of XOOPS