Power tools: Mostly Dewalt, with some Milwaukee thrown in because Dewalt doesn't make that particular tool.
Pneumatic tools: Paslode for nailers, Ingersoll-Rand for everything else, with the exception of my Snap-On air hammer (my favoritest tool in the whole wide world
)
Hand tools: Snap-On. If you ever use Craftsman and Snap-On wrenches side by side, you will find someone you don't like to give the Craftsman set to.
As far as impact sockets go Sunex is about the best deal out there. They are inexpensive (as in, you don't feel guilty when you use one as a drift punch), guaranteed, and in several years of use and occasional abuse, I have never had one break.