This is a little utility that really should be part of the OS. It removes window clutter for those of us with multiple apps open.
My only wish is that the time-to-hide could differentially set by apps, rather than a global hide time.
Downside: in my attempt to contact the developer about this wish, (I know, it is bad form to make wishes on freeware,) the site could not be accessed. And while it appears to work fine on 10.4.8, it is unclear how long it will be supported.