Don't forget to check out the LEF Gallery! Exclusively for LEF members, an ideal alternative to Photobucket, Flickr, etc. It's FREE, and best of all totally AD FREE! Just click the link!
There are plans and castings available for small 3 stage yacht steam engines that are 8-10% efficiency. I'd love to see one of those running on a home built solar boiler... but I sure like the no moving parts power of PV.