That's great, and I'm using that for things like the aspnet membership and roles.
In this case, I've added 2 or 3 cols to my table and I just need to regen the one class. Don't get me wrong, it takes 5 seconds to do the whole project at this point. But I'm concerned about a "very" large schema with more than a couple of hundered tables. In addition, while using source control, if I'm working on table a, and my coworker is working on table b and we are using a shared development db, we now have some collision on the entire batch of generated files.