I am creating a web application to help landlords and property managers. As a small time landlord myself, one issue I deal with how to price my rental property. To solve this, I'm creating a "eBay for rental properties" feature, where a landlord can list a property for rent and a prospective tenants can suggest a rental price for your property when they apply. This will help landlords know the true value of their rental property.
We are close to rolling out our beta website and would love to get feedback and tests. This is a completely free service and will be compatible with Craigslist or any other site you list rentals on.
Feel free to PM or simply provide feedback in this thread if you'd find this feature useful.