Canadians have a great screw: the Robertson or "square drive" head. When living in Canada we discovered how superior the Robertson screw is from the Phillips screw we use in the USA - and I've since used these screws in all my building projects. However, I'm running out of my stash... and I can't seem to find any sources locally. I was almost thinking I would have to make a run to Canada sometime to get some screws, when my wife had a better idea... :-)

More info:

http://www.robertsonscrew.com/history.html

https://en.wikipedia.org/wiki/P._L._Robertson

http://thefoolscapjournal.wordpress.com/2011/01/17/the-perfect-screw-a-concise-history-of-the-robertson-head-screw-by-mark-bell-obsolence-correspondent-for-the-foolscap-journal/