wow, this is the first time I've seen them... I will have to check out their offering more.

There are others too... http://appfolio.com http://buildium.com http://propertyware.com http://tenantfile.com and others. This isn't a new idea, people have been using property management software for years. We have just taken a slightly different approach to implementation with automation and communication between the two parties, landlord/tenant.