Nice shots, but I notice they are pretty significantly underexposed. This is common in shooting ice hockey since the camera wants to expose that big expanse of white ice as 18% gray level. Dialing in about +1.5 EV will typically get you close. You can also try center-weighted metering.
Properly exposed, you would need a considerably higher ISO to get the shutter speeds you got -- ISO 1600 or so, I'm guessing. The D7000 should still do a decent job at that ISO.
As Jon suggested, upping the exposure 1.5 makes the white ice and uniforms white. I downloaded the small JPG and in LR3 bumped up the exposure 1.5 and found the noise did not increase much. Since hockey is such a fast sport don't be afraid of high ISO, crank it up, add positive Exposure composition and get the shutter speed up. That camera is made for it. That shot #4 tells it all;>) Stan St Petersburg Russia
Thanks guys! I agree that brightening it up will help tremendously. I didn't want to do that because of the high ISO's needed. The D7000 is a big step up from my D40, so I just have to learn its limits.