My company has several consultants of ours that need to work in Alberta for upwards of 6 months at a time doing project management work for one of our clients, a Canadian Corporation. They will be paid by us here in the States but will live and work in Canada. There will be no employer-employee relationship between the client and our consultants. Any tips on getting them work visas?

Regardless of the relationship that you describe, a work permit would appear to be required. The details of the case would determine issues such as the best approach, etc.