They are hardly alike. There is certainly plenty that one can do with a D100, but it isn't really even close to the capability of a D7000, as one might guess from the ~$200 price compared to the $1200 price of a D7000. Sure, they are both Nikon DSLRs, and they're both DX and they both have in-camera focusing motors. The resemblance ends about there.
Tell us more about what you're trying to accomplish.
_____ Brian... a bicoastal Nikonian and Team Member
My gallery is online. Comments and critique welcomed any time!