'Class of the Titans' may have first aired in Canada on December 31, 2005 as a Teletoon Cinetoon special, but show has since been aired internationally.
Episode 1.01: Chaos 101 aired in 
Australia on April 18, 2006 as part of 
ABC (Australian Broadcasting Corporation) 
TV's Roller Coaster.  The show receieved a favourable 3 out of 4 stars in 'Television', April 16-22, 2006 edition (a scanned copy of the article was posted in the director's 
blog), with the following opening comments:
How refreshing it is to see an animated series for children which doesn't treat its audience like morons.  As well as being fabulously well illustrated, this Canadian series reveals a level of sophistication rarely seen at this hour of the day.  The show deftly combines a wry sense of humour with Greek mythology and teen angst in a high school setting.  And, as strange a marriage as it sounds, it works surprisingly well.
The remaining schedule for May can be viewed 
here.
On the European front through 
LUC, the show debuted in 
Portugal (via 
Jetix) in May and will be aired Mondays to Friday at 11:30AM and 6:00PM.  According to Director 
Brad Goodchild, Spain and possibly Latin America have also picked-up the show, and Thailand has apparently expressed an 
interest as well, though those aren't completely confirmed at this point
No word yet, official or otherwise, on securing the American rights to the show, though if that's ever accomplished, it will be through Nelvana.
If you have any news yourself about 'Class of the Titans' going international (ie. you've seen the show in your home country and it wasn't mentioned in this entry), please feel free to send an e-mail to 
age.of.silicon@gmail.com about it.