SharePoint Solutions are the first to hit the street with something many folk are building, tools for configuring Forms Based Auth for SharePoint 2007.
I haven't tried this yet so I neither recommend this nor pour scorn upon it!
Jeff Cate, however is a allround solid dude, so it surely must be decent. I will post back more once I've given it a go.
Link to SharePoint Solutions Blog: Released: Free Utility Quickly and Easily Configures Forms Based Authentication for SharePoint