I would have to say Service Broker as one. There is a lot one can do with it, and quite a bit of the necessay infrastructure is already built. The problem is that you still have a lot that needs to been done manually and it isn't all that intuitive.

Wizards would help, especially if you get to look at the SQL it builds for you instead of just doing it for you (like Database Mirroring - Would benefit from being able to see the scripts that wizard builds and the order they are run).

This is one way some people learn, show me what you do at the basic level, and let me learn how to do the more complex stuff by building on that.