AMEX Bank of Canada also offers savings rates comparable to ING Direct. AMEX didn't have a corporate account option last time I checked, though.
www.americanexpress.ca
As I type this, the rate at AMEX is 2.30%, whereas at ING Direct it is 2.25%. AMEX Bank always seems to be 0.05% higher, although that's only $50/yr difference on a balance of $100,000.