Well there are a lot of insects out there. Primarily we deal with structural infesting insects. Here there are links to various sites that are very informative for identification. I use The Bug guide site for identification as I know what I’m looking for at this site. You may also post pictures at The Bug guide for identification.
Another area you might find information on and have identification done by picture is Pest Control Canada.
When trying to identify insects keep in mind that there is much to know about identification. The classification or the taxonomic hierarchy is important and that helps very much in identification.
I’m not going to re-invent the wheel so I will be posting links to good information regarding insects. Again its because that information is already out there, you just need useful information.