I found out about Google Maps Coordinate from a CNET article that was featured in a linked in newsletter this morning. I've already forwarded the link to two PMs working on a distributed workforce project. The app integrates Google maps with location awareness of your workforce presented as callouts on Google Maps. The app also includes some work management application with work orders and statuses.
Tons of utility offered here. Initial cost is $15 per worker per month. This looks like a winner!