Dion Almaer talks about RDBMS, ODBMS and Google's App engine. It's an interesting discussion, and it touches on line between the academic world and the business world: RDBMS is the de facto standard for data storage in business, but will it stay so, in the face of all the alternatives that are popping up?
My bet is that in the end, SQL will win. There are too many SQL-driven behemoths out there, and for the ordinary teenage learner, SQL tools (via PHP, or Visual Studio or whatever) are widely available and are very easy to play with.
Nonetheless, I'd like to see some more dissemination for these alternative data storage models, so that their patterns become more apparent, and so that they can ultimately be standardized (even if only loosely by de facto usage)