"The way webs are made can be a clue as to which spider was the resident of said web." - Will
I loath spiders! But non the less this is a cool fact. Makes sense that all different kinds of spiders weave different webs. Any spiders that you watch out for in Burlington? I imagine we have them here in Guelph too...
There are few dangerous spiders in our area. Though, there are always possibilities of the spiders being transported to us, and these possibilities are possible enough to at least educate yourself about the species. This often happens in food shipments or shipments that come from warehouses or factories.
The Brown Recluse Spider (Loxosceles reclusa) and also The Black Widow (Latrodectus spp.) ARE found in Ontario though encounters with this species are usually reported towards the far South West of the province.
This site is a non official for "pest in Canada": http://www.pestcontrolcanada.com/INSECTS/spiders.htm
They have decent info, but unfortunately they consider EVERY bug a pest, and they don't really speak much about the pros of these bugs and they truly focus on the cons.