I just came across this web site:
http://www.glassdoor.com/
It is pretty interesting. You can search salary information and reviews of companies that have been entered by anonymous employees.
The part I found the most interesting is reading through the employer reviews. Many of the companies I am familiar with had reviews that were not too far off from what I have heard. Some of the reviews are a little jaded, but you can pick out the useful information in those as well.
The sample size for Calgary is a little smaller than I would like. They have 152 reviews for 94 companies in Calgary. It would be better if there were more, since most large companies only have one or two if any at all.
Note: you have to enter information in order to see all the other information. I am not usually a fan of websites that force you to register, but I think it makes sense in this case. Without it, I don't think that they would have enough data to be worth visiting.