Since a couple of weeks the European Embarcadero site hosts a white paper by Brian Long on Delphi Prism 2010. As for my paper and the one of Bob Swart on REST and DataSnap (respectively) you have to leave your contact information to download the white paper and there is a large series of videos (in this case 6) covering the white paper content. As a Delphi and .NET expert, Brian does a very good job explaining Delphi Prism in details.

As there isn't a single page listing them all, here is the list of white papers on Delphi 2010 (the three on the European site and the one by Cary Jensen):

Delphi 2009 white papers (including a few I wrote), instead, are listing on the Developer Network site at http://edn.embarcadero.com/whitepapers.