I have added a new post outlining the steps to generating an Application Usage report. Hopefully you find this useful.
Now i need a tool that let's me change the application on old versions of files so I can finally delete some of these old freaking applications!
hmm. probably will also need to hack on this at some point to let me define multiple applications and dump links to all files still assigned to them. Doing this is in OR searches sucks and the powershell cmdlets can't set the application to search for.