The new 105mm Micro-Nikkor, like the old, gets to 1:1 (and does so without any visible lens extension). The closest focusing distance is 1 foot (0.314m). Since the lens has a 62mm filter size, Nikon's 5T and 6T close-up lenses fit nicely onto this lens, which, together, will get you down to a 9.6" (24.3cm) focus distance (note that this puts your subject within 4" of the front of the lens, though.
Got it! -- Nikon 18-200mm "It's a miracle! I bought mine in November 2005 and love it. It's replaced an entire bag of lenses. All I bring anywhere is my 18-200mm, and maybe my 12-24mm for 99% of everything I shoot." $846.95 new