Missus has a d70s, she's looking around for lens' too. Not all nikkon lens' are ccompatable with all nikkon bodys, only the latest models have some sort of compatability. So you got to check before you buy.
- UV fiters do sweet FA on DSLR's (athough some people swear by them), they are good protection for the lens however.
-Polorising filter is good for taking outdoor shots, keeps the contrast nice, makes for less reflection from water or gloss paints, also good protection from flying rocks at the track. Not to be used indoors
- "f3.5-5.6G VR is the F-stop range, apparently the GF says that this is a standard kit lens you get with a camera, it basically says that this lens will show everything as sharp, from .28 metres to infinity. As you can proly tel, you will not be able to zoom much with this lens with a small focal length of 18-55mm. Other f-stops can be make the obect at the right distace be sharp and the fore and backgrounds be blured, making the object "pop". For more info you'll have to wiki f-stop, its really complicated. The AF at the start of that ebay lens name means that it is auto focus, the "s" is something to do with the shutter.
- Fish eye is a convex lens, like what is used on skate videos, as per below
The genuine lenses are good, the more expensive ones have a larger finer ground lens, so the quality is a little better, but unless your a professional photographer, you really dont have to worry that much. Standard nikon ones will be fine.
Thats about the end of my knowledge. Good reference site