With the G8 in Huntsville and the G20 in Toronto - protest groups have to determine where they will get the most attention and most are choosing Toronto.
With the potential of 40,000 protesters people in Huntsville are breathing a little easier. It doesn't mean that there won't be issues, but the large numbers of people initially expected at the G8 will be significantly reduced.
An interesting article on the decisions being made by protest groups can be found at
http://www.thestar.com/news/canada/article/810103--leaders-papier-mache-heads-to-appear-at-g20-not-g8