I have a D7000 and I'm happy with it, and I do not plan to change it.
A colleague at work has the Sony SLT A55, therefore during a fun day at work we had, I could compare both cameras.
I know that this is not a fair side-to-side comparison, due to the fact that one camera(D7000) is almost twice the price from the second one(SLT-A55)
Although I prefer an optical viewfinder, the viewfinder on the Sony was not bad at all, it is an electronic viewfinder, that also displays additional info like histogram on the viewfinder, that can help you (if you want) to nail the exposure as you want. Also, we took a series of photos from some fun water activity, and I felt that my Nikon is much slower (I shot in RAW, up to 6fps till my buffer filled up, while the Sony was working at 10fps for a larger time).
The idea of The Single Lens Translucent (SLT) camera is not bad, I guess that this allows the 10fps as well.
Also geotagging is builtin on the Sony, a feature I miss on my D7000.
It is true that the Nikon feels better in my hand, and I do not feel the plastic as the Sony one, and also It seems that the Nikon may last longer due to its robustness (Although the D7000 is not a pro camera)
About features the cameras provide, most of them are the same, with some additional stuff provided on the Nikon, that allows you to customize the camera to your habits, like more WB settings, you can go up to 1/8000 on the Nikon, exposure compensation or bracketing (which i use) is more flexible on the Nikon..
I wish Nikon could also add some features on their cameras like geotagging.