I make mason bee houses(hotels, whatever) where ever I end up living (renting, moved around a bit). They're pretty awesome, no stingers, pollinate everything, and the houses are easy to build.
Interesting, thanks for posting this. I take some care to plant 'bee friendly' stuff but have no interest in beekeeping and have never bothered to look up fostering non-honeybees. Now I will do this after reading your comment http://www.ecolandscaping.org/03/beneficials/attract-mason-b... and some of the links from there.
Great! Mason bees are very gentle, and are good pollinators for fruits, nuts and certain flowers. We've had a small mason bee house for a while in the back yard. My son loves it. :)
I live in Colorado. We have mason bees around here. And you should be able to find mason bee houses in certain big garden centers, big home improvement shops and online: