frame rate of D7000 is about double that of the D300 if you use raw I believe as I think the D300 drops to 2 or 3 fps whereas the D7000 keeps going at full rate.
The D7000 can shoot 22 Jpegs @ 6fps before it starts to slow down. It can shoot 10 RAW files @ 6fps before it slows down.
The D300S can shoot 100 Jpegs @ 7.1fps. That is a big difference of 4x the number of images compared to the D7000.
It can also shoot 17 RAW files @ 7.1fps before it starts to slow down. That's a 70% increase in the number of continuous image capture ability. Only prospective buyers can say how important that would be. :shrug:
I haven't heard how any new SD cards affect the continuous shooting rate/capacity. :shrug:
The battery grip can also increase the frames per second rate to 8 when used with certain batteries.
Those figures are from the reviews of each camera at DPreview btw.
As mentioned by Frobius, the RAW frame rate on the D300/S drops when used in 14bit mode. Again, according to the review of the D7000 says that the viewfinder is the same as the D300S. Only a side by side test could say whether they are different, but I doubt they are, taking the numbers into account.
Choosing between the D7000 and D300S is a very difficult decision, as Nikon have upped the specs a lot from the D90, and approached/matched/exceeded some of the specs of the D300S. Nikon are keeping quiet about the D300s successor, should there be one, as if it exists, it would affect possible D7000 sales as in the case here.
The Tsunami in Japan will have an affect on Nikon's plans to some degree, but I doubt the consumer will learn how it is affecting the camera release plans until maybe a camera is released. And even then, they may not let people know what the effects have been beyond how long the factory was shut for.