From Stephen Gordon's blog:
As you can see, we have pretty high corporate tax rates relative to the developed world. By 2013 or so, between the feds and McGuinty's plans, we'll be down to 25%. That's still a fairly decent level of taxation. If you look at some of those countries on the bottom-right, they are hardly corporatist free-for-all countries.
I guess what I'm trying to say is that you make the mistake that many people on the left make: they think corporations are people that hoard wealth. They aren't. Every dollar a company earns goes to either the owners (and they get the risk-adjusted world rate of return), or the workers (who basically get the rest). You take more money out of the corporations, then the owners continue to get the risk adjusted world rate of return (or they take their money and invest somewhere else), and the workers take the hit.