The web platform installer was used to install the Web Farm Framework 2.0 onto the load balancer. The guide "Setting up a Server Farm with the Web Farm Framework 2.0 for IIS 7" provides an easy walk through for getting your web farm setup. However once it has been setup there are a number of steps that still had to be configured to ensure the web farm worked correctly.
Before completing the following steps I ran into a an issue where the server would appear available for load balancing in the "Servers" view, but would be unavailable in the "Monitoring and Management" view. To resolve try the following steps.
1. Health Test Url
Make sure that the health test url has been set. The application request routing uses this to test whether a server should be used for load balancing.
2. Default App Pool Settings
Edit the advanced settings of the DefaultAppPool on the controlling server and set the recyling value for "Regular Time Interval (minutes)" to zero.
3. Set Primary and Secondary Servers to Response to Ping
Update the firewall settings on the Primary and Secondary servers to respond to ping.
These are thing steps that I followed to get it to work correctly, they might vary for you depending on your setup.