The Nikon D7000 and Canon 7D or Canon EOS 7D, which is its full title, are often compared and you can find other reviewers doing just that. However, these SLR cameras have significant differences that make comparing them rather difficult.
For starters these two digital SLR cameras are priced with a difference of around two hundred dollars.
Size wise these two cameras are very similar, but the Canon body is about 130 grammes heavier, so the lenses you choose to pair with them will probably be a greater factor weight wise. Both of these cameras have a built-in flash, which is well disguised, popping up when required.
The cheaper of the two, the Nikon, has a specification that does compare well with the more expensive Canon 7D, and is better than it in some respects. Almost all professionals and semi-professionals require dual card memory slots (2x SD/SDHC/SDXC Cards) which the Nikon D7000 has, something surprisingly lacking in the Canon.
So the Canon 7D has two megapixels more than the Nikon, however image quality is affected by factors that are more significant than this difference in the number of pixels. The Nikon has 16.2Mp and the Canon 18Mp, which are more than adequate in both cameras.
For photographers who like the ease of point and shoot video making the Nikon D7000 does this better than the Canon. With an AF-F focusing mode the Nikon D7000 allows autofocus operation during shooting, something the Canon can't do. However more serious users will like having the option to shoot more flexibly when using the Canon. The Canon however does have a greater range of frame rates, which should keep those who like to make more sophisticated movies happy. The Canon 7D for its size has the fastest continuous burst rate of any DSLR at 8 fps.
Buy either the Nikon D7000 or the Canon 7D and you will be able to take brilliant photographs. How you wish to go about taking these photographs should probably be the deciding factor.
The Nikon D7000 is likely to be favorite with amateurs or semi-pros due to being able to take great photographs relatively simply when compared to the Canon. Even missing the dual memory slots of the Nikon, the professional photographer is probably going to choose the Canon because it will allow you greater flexibility in controlling the settings.
Assuming price is not the ultimate factor in making a choice, look at what your own photographic requirements are likely to be now and in the immediate future, then pick the one that meets those needs.