Nikon has updated software for the WT-4 wireless transmitter. The new update provides support for the new D7000, Mac OS X 10.6.4 and Windows 64-bit OS, along with bug fixes. You can download the updated software from Nikon’s website via the links below.
Canon has made available firmware updates on several DSLRs for compatibility with the recently announced, and soon to be available, WFT-E2 II and WFT-E4 II wireless file transmitters.
Note that the 5D Mark II firmware update also “Corrects a phenomenon in which visible noise may appear in images taken by continuous Bulb shooting.”
See the following links for the respective firmware update pages.