The 18-200 VR is a great "walk around" lens (don't own one, but have used it).
Price-wise (and if you don't mind changing lenses), you might consider the 18-105 VR (that's the standard kit lens for the D7000) and add the 70-300 VR. This is what I have, and use most. The 70-300 VR will give you a bit more reach than the 18-200 and I've found it to be a great performer. The 18-105 is no slouch and it's a true bargain because they make so many of them. Those two lenses probably cover about 95% of what I do, and the 18-105 gets a lot of use. I usually have the 70-300 on for things like the local Renaissance Faire and the beaches of Cancun. ;)
Been getting a bit more into macro stuff lately and have a 55mm f2.8 AIS (manual) lens, the 60mm f2.8 D (AF, but uses the screw drive) and the king of the Micro-Nikkor line, the 105mm AF-S 2.8 VR ED N. Wouldn't buy any of these unless you're into macro stuff. Probably the least-used lens I have is the 50mm f1.8 D. Great lens, just doesn't get used much. Keeping in mind that the D7000 has an APS-C sensor, all of these focal lengths get multiplied by 1.5 for comparison with 35mm film cameras.
The 18-200 is a fine choice, though. You might try it and see if you even need anything more -- it's the "only" lens for a lot of people and if I was only going to have one lens, that would probably be my choice. With VR and the high ISO capabilities of the D7000, the really fast lenses ($$$) aren't as important as they once were. The D7000 is really quite a lot of fun at ISO 6400 (but that's pushing things, so to speak).
Accessories... You'll want the ML-L3 remote (just get it, it's cheap). Amazed at how much that gets used. I've also got an SB-800 flash (now replaced by the SB-910). No idea why those things are so expensive, but they sure work well. Spare batteries... I'd considered getting the MB-D11 battery pack, but the D7000 is so low-power you don't really need it -- it really will do 1,000 shots on a charge. One spare so you can charge one while using the other is probably more than enough.
I'm not a big fan of the "comes with" camera straps. Don't care for the advertising, and they're just uncomfortable. I use this:
http://www.amazon.com/gp/product/B00...pf_rd_i=507846 Quick-disconnect and it has a pocket that's perfect for the little remote.
Of course, there's the other stuff, too. A decent card reader for the computer, a good tripod, camera bag, etc. I've been using 8Gig Sandisk Extreme memory cards (20 or 30 MB/s - fast enough for HD movies) -- don't shoot much RAW or movies and 8 Gig almost seems too big.
If you want a really good book on the D7000 (User's manual done right!), get Thom Hogan's e-book here:
http://www.bythom.com/nikond7000guide.htm The Nikon book explains WHAT. Thom explains WHY. 820 page PDF file with a bunch of other goodies.
Then, there's software... I've become a big fan of Adobe Lightroom over the last couple years. It handles most of my editing, but is also excellent for cataloging everything so you can find stuff easily. The latest version even interfaces to Blurb for making photo books and has a built-in mapping feature for off-line geotagging. For HDR, I use Photomatix Pro and just started looking at Zerene Stacker last weekend for focus stacking (that'll teach me for going to a George Lepp seminar).
Beyond all that, it's like ham radio. Just no end to the ways it can drain your wallet.
D7000 & 70-300 at max zoom:
Four Friends, Cancun Beach by
tatanka01b, on Flickr