DVDlab is fantastic. You can do basic DVD authoring without even breaking a sweat, yet it has phenomenal capabilities for doing some pretty advanced stuff. In combination with the free IfoEdit, it looks like I can do just about anything the expensive commercial packages will do, with a savings of several thousand dollars.
I know it sounds weird, but it makes me want to do a DVD of nothing but menus, just to see what sorts of things I can do with it. (And I hear DVD authoring can be a lucrative field...)
On the downside, Karen says she's getting jealous of my DVD burner, since I've been spending so much time with it.