I've been working with the BDC recently.  I have to point out on the coolest things I love about BDC is not the search piece but integrating BDC into your SharePoint lists.  In case you didn't know, you can actually select Business Data as a column type.

Once you do this, you get name resolution against the backend system, bringing in related data from the backend, etc, etc.

I'm just finishing setting up my Beta 2 farm so I don't have screenshots on Beta 2 but will after we ship it.

BDC. . . one of the most exciting features in MOSS 2007!  Give me your comments on it.  I'd love to hear them!