There's no consolidated info that I know of but there are a reasonable number of programs in the US that will accept IMGs. Generally, programs in the East, Ohio, Chicago will have Ireland more on the radar than Western programs. Irish students regularly go to the Mayo, Hopkins, Harvard, Cleveland Clinic, Bay State (Mass) to name a few. Really, it's word of mouth on which programs to try or else just pan with emails of inquiry and see what you get. I know some have also worked around "rules" that bar IMGs by utilizing contacts within a given university and sort of ignoring/circumventing the official line with a well-placed endorsement.
As for Canada, it was a bit more grim until just recently. A majority of programs had barred IMGs (with the exception of some in MB, SK etc.) But I recently spoke to a clerkship director at UBC who told me that all the Canadian schools have just this spring agreed to generally open electives to "Canadian citizens in school in Ireland, UK, Australia, New Zealand and South Africa." I think many of us who qualify in this way have long felt that we deserved a bit of a boost and here, at last, is a small concession in the right direction.
Regardless of the program, apply VERY early and be respectfully assertive. Add extra CV-type material to your application and be prepared for a spot to materialize very late in the process (eg as late as May or even early June for a July elective). Also, some students have succeeded in getting electives after third year (of five year program) as well as before final med. I leave tomorrow for a 4 week emerg elective in Winnipeg that was technically only open to students "entering their final year". I don't know how, exactly, I snuck in (I'll be a fourth med this fall) but here I go. (I think, actually, that my extra/unsolicited "letter" detailing my sincere emerg interest/experience did the trick but who's asking?!)
Be confident and good luck.