yeah but if you get its going quick - is that really lazy? If you value more getting it done and working over getting things "right" from the start - for many cases that is a good enough approach.

Although what I find interesting is the data store in google app engine - if you can work within that sort of database, you have a much better chance of scaling if you need to (and like you said, you rarely need the relational part of a RDBMS anyway).