Dear Stephen,
You will certainly be able to use the same lenses, but need to be aware that because of the difference in size between a normal 35mm film frame, and the light-sensitive chip used in a Nikon digital camera, there is in effect a 1.5x increase in apparent focal length of any lens.
Using the lenses you have, this would create images the equivalent of using the following:
1. 28-100 = 42-150 mm lens
2. 70-300 = 105-450 mm lens
Great if you want to take telephoto bird images, but not so helpful if you are interested in wide landscape vistas.
The actual focal length is not, I understand, changed, but you receive a "cropped" field of view, and so this appears to be magnified or made more "tele" than "wide" angle.
There is much debate over whether Nikon should or will use a "full-frame" sensor, similar to some of the high-end Canon digital SLRs, and as has been discussed on this forum many times, there are both good reasons for and against. However, if you wish to use a lens on any Nikon digital, it is important to remember that the quality will not necessarily suffer for using a sensor smaller than a film frame - just the effective "field of view".
I hope this is helpful.
Kind regards,
Ian<font face="arial,helvetica">
