While an interesting concept, the Manpower website isn't used enough to be valuable at all. Unless they can somehow convince both employers & potential employees to use the site, nobody is going to bother to start, which is an interesting circular problem (similar to the value of social networks equaling the users-squared, that we discussed in class).
I searched first for my hometown in Tennessee, which did not have any posted jobs available. Next, I searched for the town in which my parents currently work (not huge, but larger than my hometown). Again, no posted jobs available. Lastly I searched for Madison, WI, which had 11 posted jobs available.