Ray: Wouldn't Data Grid work hand in hand with DataAssist!
I hate always bringing up Interakt and ADDT - but they handled data with Nextensio Lists/Forms. 2 pages (a list and a form) did everything that Data Assist did, and I believe the premise of "Data Grid" was thought of around that.
I don't think they should be considered separate items! Integrate them!
Just my 2 cents!