Just thought I'd pass this along, in case you were wondering how it's done. It's from Plato in our support team (thanks, Plato!):
To add our ASP.NET controls to the component palette in RAD Studio 2007,
invoke the Installed .NET Components dialog, go to the Assembly Search Paths
tab and add a path to our DLLs to this list. Then close the dialog and open
it again. You'll find that our controls have been added to the component palette.
Wow, that was easy...