For customers in the US / North America, the direct download links are:
NX 2.1 appears to resolve issues with labels not being properly read by Photo Mechanic and vice-versa. Moreover, the NX 2 File Browser auto-refreshes when you change stars or labels on your NEFs in Photo Mechanic. I strongly recommend this update.
You can download a 60-day trial version of Nikon Capture NX 2 and give it a spin before deciding to purchase the software.
At the same time, new versions of the free Nikon Transfer software that supports the D90 was also released. Again, here are the direct links for US / North American customers: