UPDATE: June 23rd.
There's now the canadian exchange cavirtex.com which was accepting CAD via interac e-mail, but no more till they're out of beta.
There's also a google-group discussion about an alternative:
1) Join us on IRC (check out the quickstart guide, if needed)
2) Join the bitcoin-canada meetup group!
3) How to securely trade bitcoins using Interac email transfers and clearcoin.
4) Checkout the RFC for a Canadian bitcoin exchange. Tell us what you think!