Except that the adapter you linked to seems to be mis-labelled since the same seller also offers another Nikon to m4/3 adapter -- labelled as Adapter NIKON lens to PANASONIC G1 GF1 OLYMPUS E-P1/P2 -- that looks like this:
Originally Posted by pellicle
This adapter appears to have about the same depth and diameter as my Voigtlander Nikon to m4/3 adapter.
The adapter you pointed to -- labelled as Adapter NIKON lens to PANASONIC G1 GF1 OLYMPUS E-P1/P2 -- looks completely different and has, further down the page, the following description:
This Adapter will allow to use PENTACON 6 (Kiev 60) lens on PANASONIC G1 /GH1 /GF1 and OLYMPUS E-P1 E-P2.Which makes sense because this adapter, with the tripod mount, is so much deeper and wider than one would expect for a Nikon to m4/3 adapter but about the depth and diameter one would expect for a 6x6 lens:
Here's hoping that similar adapters with tripod mounts appear for Nikon, Olympus, Canon, and (for me) Minolta MC/MD mounts.