hehe ni-react lang ko sir kay murag sa previous statement kay na-compare ang upgrade to D3100 to an upgrade to D7000.
If I were doing landscape photography like you (nice photos and work on contributing to the drupal community), I might stick w/ the D3000 but since I want the option to shoot decent video I would definitely benefit from the MP bump and the EXPEED 2 on D3100.
What I'm saying is the upgrade from pre 2009 DSLR to D3100 would be worth it for any noob like me but if were saving for a D90, better jump right to D7000 and really get a taste at how expensive getting photography as a hobby and what mid-range DSLR really has to offer in terms of control and functionality.
Anyway, just adding additional info about the D7000 for everyone else who hasn't read online details/previews.
The D7000 shoots almost the same video resolutions as the D3100, major differences lies with data captured (14bit vs. 12bit, D7000 and D3100 respectively), mic jack availability on D7000, ISO (for low light, D7000 should easily trump D3100), AF points and the cross-type sensors available in the system. D7000 has 39 AF points/9 cross-type sensor and D3100 has 11 AF points/1 cross-type sensor. For an explanation on the difference here's a link to an article about sensor's auto-focus:
Understanding Camera Autofocus
The only thing I want on D7000 that I did not see is the PC sync port.
For now everything about D7000 looks good on paper or the technical specs are great but we will have to wait for production reviews by October when it's released.