I used to tell people to use Homestars but I'm starting to get very very suspicious of how every company has a 9.8 or a 10 total rating. There's something fishy going on.
Wow 1 Day painting is one that a buddy of mine used recently. He needed a fairloy large interior painting job done quick in 1 day. Their pricing is quite expensive though, but that's to be expected considering their 1 day guarantee.
My father used
Greater Toronto Painters | Home, Condo, and Commercial to do some painting for the porch and they did a good job for a good price. They're not as well known of a company though.
I've also heard that College Pro is pretty solid, although I'm not sure how much you'd want college kids to do your painting and such.