I've been playing around for the last couple of months with a Hoya R72 on my Fuji X100. I can shoot this at between 1/15 - 1/60 and f2 so hand held is possible but a tripod is preferred.
The R72 seems to be the best option to start off with as it isn't too expensive and lets more wavelengths through in the near IR range. Have a look on the Flickr IR groups, I found some good links through there to other pages.
I suspect the D7000 sensor has a very strong IR filter though so I'd look very closely at whether it can actually do much if that is the camera you will be using. My understanding is that most new DSLR's aren't good unless modified to IR.
Derek - Nikon, Manfrotto, RRS, Apple *- PPOK -*