I think she is not the best choice but she is a good choice. She is a weak candidate in the experience zone, but she has had so far good reps as a gov of a state that is often run as a socialist state on the politics side. Lots of fed and state entitlements and programs fund most of the states businesses.
I think there are a few other people he could have tabbed who would have built him a stronger case, but this is not a bad choice, and she will tie Biden in knots.
To the most serious point, is she a heart beat away from being ready to be Pres. no. and that bothers me. While Biden is an a hole, and the thought of his title being "Mr President' makes me gag, I do believe his background would let him handle the pressures better. That said, if he was to be sworn in, I would have to start diggin holes and burying stuff.
I think Christine Todd Whitman, former Gov of NJ and JaneDee Hull of Az both would have been stronger choices, with stronger national presences.
I think Whitmans current role in the Energy business may have caused them to bypass her.
I think karen Hughs would have been a terrific and un conventional pick. While never having been elected herself, her skills at electing others and then advising them well would be a HUGE plus side to the McCain camp.
There are several other unconventional choices as well, but I think Condi Rice would have killed the Obama black and reparation-minded white liberal vote advantage.