Useful Photography Features
--100% view finder! Big bright with 100% coverage. No more guessing of your framing. (It is not as bright as the D700. However, it is 100% vice 95%)
--2 SD slots - When your getting paid to shoot a wedding or any gig, my card broke is not an excuse. Very useful feature. For the home user put two smaller cards rather than one big card and save some money.
--Smaller and lighter than D300, D700, D3s, D3x- When you stand on your feet for 9 hours shooting the wedding and reception, you start to feel every ounce you are carrying. Often you will be carrying two bodies with a fast tele zoom and fast wide zoom. That starts to get heavy. Light weight here we come.
--2016-Segment RGB Meter- for spot on exposure and white balance--No one touches Nikon on this and this one is fantastic.
--1/8000th -- Very useful for shooting into the sun wide open with a bright lens
--1/250 -- Could be better (1/500th for D40) but could be much worse. Auto FP helps.
--Magnesium body and better sealing -- Shoot in dusty environments without messing up the inside your camera.
--Uses the ML-L3 infra red remote -- Small and cheap. IR sensor on the front and back of the camera.
--Autofocus focus motor for non-AF-S lenses.
In the end it all comes down to what is important to you. Smaller weight and size is becoming much more important to me and this camera is a very good trade off of features for size and weight. Anything that is missing I don't even use so I am not sure what it may be. My D700 was recently stolen and while I miss it, the D7000 is a worthy replacement for it. I opted to get the D7000 and Panasonic GH2 and save the $300 difference for a lens.
--100% view finder!
--6 fps (7D is 8. However, I think this number is overhyped in most cases. Even shooting at 3 FPS will fill up you card with photos that look remarkably similar) 8+ is needed for professionals shooting professional sports. Not enthusiast shooting High School etc.
--16mp sensor (a marketing increase but still nice to allow some room for cropping)
--14 bit photos
--39 point auto focus sensors (19 cross point) this is a bit of a marketing thing but it is still nice and it does not matter about the 51 on D300s and above. Still very nice.
--2016 scene meter - compares against data base for WB setting and color settings
--Excellent battery life
--MD-11 Optional Battery Grip
--2 SD card slots for back up redundancy or double the card space! Outstanding
--Magnesium used to make camera stronger
--16mp senor (takes up more storage on your hard drive) (12mp JPG 3mb 12 mp RAW = 12 mb 16mp JPEG = 5 mb 16 mp RAW = 16 mb. This is for 12 bit. 14 bit would require more)
--Camera heavier than it used to be
--No swivel screen - after using the GH1 extensively you really miss this when shooting at weird angles. You especially miss it for macro photography.
--No full time live view - Ditto from above. Live view is what you see is what you get. Forgot to change white balance-- you will see that when people are yellow, blue or green. Have it set in manual and blowing everything out-- you'll see that as a white screen.