A word of advice to my friends - if possible, avoid working in two countries in one tax year and/or having investments in your name. It will make your taxes so much easier to do.

I unfortunately have both, and it's an absolute nightmare. I think I may end up having to wait until I do my Canadian taxes, so I can figure out what of the Canadian income tax I paid qualifies as a tax credit against my US taxes - Canadian income aside, I owe the US federal government $61 at the moment, because I had no taxes withheld.