I know this is getting boring, but I wanted to make one additional point - all of the D900 compatible product listed in the past few days had one thing in common: the only odd model in the description was the D900. Not the D700s, D800 or D400. If the intend was to attract more keyword searches, they would have listed all Dxxx possibilities for maximum exposure. In almost all entries the D90 is listed separately, which means the D900 was not a typo.
Here is another one - a remote control that supports Nikon D900 (again, all other models are valid, except the D900):
BTW Nikon removed the second D60 entry on their website.