This is the Nikkor 18-70 f/3.5-4.5G AF-S ED lens, which sells as a kit lens with some Nikon Digital SLRs and served as my very first Nikon lens.  It has a nice silent focus motor and very good optics for its price ($200-300 these days.)  It's pretty sharp and has good color rendition.  Nikon's marketing and information page on this lens is located here.  There is noticeable barrel distortion and a bit of vignetting at 18mm, so I try to avoid using that part of the range when it's important to keep straight lines showing as straight near the frame edges.  Other than that and the somewhat smaller aperture, I have few complaints about this lens.  In the scheme of more pro-oriented optics I own, this is the most consumer-oriented lens I have, but I'll keep it, as it proves to be useful from time to time.
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