Some things to consider if you're contemplating entering any of the US WINTR Series events: you'll need a passport to get into the States; their rally rules are a little different (e.g. timed to the 1/100th of a minute). Maybe Steve M could post a link to the SCCA rules?
I'm planning on hitting a couple of the US events (Ohio and NY), but I have no illusions that I'll be up there in the overall results; I just want to enjoy a different rally, different roads and rules, and meet new people (other than the local constabulary).
Don't forget the ORRC series - January Jaunt in Waterdown Jan. 8 and Rideau Winter Rally in Perth Jan 22, 23. And of course, the MLWR that Jane and I are working on right now, Feb 12, 13. http://www.mlrc.ca/MLWR/index.html