I should have posted this much sooner, but here goes. This is a quick how-to procedure for installing and configuring the IIS side of things. I'm using Windows Server 2008 R2 and IIS7, but this is pretty similar for Windows Server 2008 as well.
IIS Configuration Procedure
1. Download the wwa.zip file and extract it to a folder on your IIS host server
2. Open IIS Manager
3. Expand the Server object
4. Right-click Application Pools, select Add Application Pool…
5. Enter a Name for the new pool (leave other defaults alone), click OK
6. Right-click on the new Application Pool, click Advanced Settings
7. Select the ellipses (…) next to the Identity setting…
8. Select "Custom account", and click the "Set" button
9. Enter an account (with sufficient account management rights), and the password…
10. Click OK, click OK again and again to return to IIS Manager.
11. Expand Sites, right-click "Default Web Site" and select "Add Application"
12. Enter the Alias, and select the Physical Path, and click OK
13. Double-click Authentication
14. Disable "Anonymous Authentication" and enable "Windows Authentication"
15. Right-click on the web application object (e.g. "wwa") in the left-hand panel, and select "Manage Application" / "Advanced Settings…"
16. Change the Application Pool setting to "WindowsWebAdmin" and click OK
17. Click OK and close IIS Manager
You should be good to go. To test, open your browser and navigate to the appropriate URL. Once opened, click the "About" link at the bottom of the home page. Under the "Web Server" section, verify that Authentication Mode is "CONTROLLED" and that your domain account is shown for the REMOTE_USER value.