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Adobe DNG Converter is - apart from View NX2 - the only free alternative if you run a version of Adobe Camera Raw (ACR) that is incompatible with your new Nikon. In this article I enlist a number of software alternatives and extensively describe the RAW-DNG conversion process, which is the same for any RAW format, independent of brand. DNG files can be opened by ACR ever since the first version of Adobe Creative Suite.
Adobe Labs has released the Camera Raw and DNG converter Release Candidate v.6.7, while Nikon in recent weeks has released updates for View NX2, Capture NX2 and Camera Control pro. All these new releases add support for the Nikon D4, D800 and D800E and now all run natively on 64-bit systems. Download here.
I thought it could not get any worse after testing Capture NX2 and View NX1.5 a while ago, but I was wrong. NX2 is worse, at least from where I am standing. So much worse that I have not been able to thoroughly test it, not on Windows XP Pro x64 nor on a "standard" XP Pro 32 system.
There is a rising number of users who report that - at least - Nikon View NX does not work on Apple's latest OS, "Snow Leopard". Nikon are currently addressing this issue and testing the Mac versions of their software for release in the near future. More info here.