Regarding the SC-17 flash cord I include with the the SB800, it is a relic from my FE and FE2 days. You will most likely not need it if you buy the SB800 together with the D7000 (and why wouldn't you?
) because the D7000's built-in flash can control the SB800 wirelessly. However, it is useful to have, in case you have a camera without commander flash, and want to get the SB800 away from the lens. And it supports TTL flash exposure control with all Nikon bodies that can do it.