Don't worry bro; it's compatible, prepare to get poison 
FX  = Full Frame (D700, D3, etc)
DX = Crop Sensor (D70, D90, D7000, D3100, D300, etc)

New DSLR got new technology 
Basically, many things are improved.

Then I suggest you try to stay away, especially from holding one     

24 on DX is not wide enough, if you like to capture landscape and/or group photo. Test the Sigma or Tammy 17-50mm f/2.8.

for the 50mm prime, get the f/1.8D if you're on budget, forget about the 1.4D; IMO, not worth spending on it, if you want to get the 1.4D, might be better to spend a little more and get the G or Sigma.
50mm on DX indoors is a bit tight too, 35mm on DX is just about right. Even with the 35mm on DX, it can still get a bit tight depend on the situation.
But you already have 18-55mm right? I think you know the range well and what range you use more indoors.

Nissin or Yuong nuo stg.

go grab nissin di622

if I have 8k I will grab d7000 (body) + 50mm 1.8 + tammy 1750 + and lastly sigma 70200

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Added on January 31, 2011, 2:50 am

yeah it is compatible. Check on Google for the difference I myself didn't memorized that

I suffered AF problem on my tammy in low light. But after attached with my flash unit and it turned great. Assist light yo!

Mine is VC version. low lights situation. You can feel it's trying to focus the subject for 3~5 seconds or more, af motor sound keeps going to focus the subject else you might need to chance position so that you can focus it right. If it's on still subject it's acceptable, but a big No to a moving subject.

Tammy quite soft lo

Nikkor way better.
That blog is bulllocks
Same thing. Inspira better Or Lancer ? Pay peanuts, get monkeys

That is provided you nail your AF . Under low light it is bad.

how do you know his friend using Nikom?   
AMAZING! 

OL theme . Well in a shopping mall... lol competition haha~

Then how the lens focus ?
Explain to me then.
You guys actually take stop watch to compare the speed of focusing ?
C'mon get a life. Fast or slow, does it really matter much ? And as if you're shooting sport with that bloody 50mm

And they don't blame themselves for buying low end camera which cost RM 9.90
Apparently, the slow focus isn't the lens problem. Is your bloody camera problem. It focus fast enough on D700 and above series. Reason ? Blame Nikon for not giving better AF module in your low end camera

why do you said Nikon produce better camera? i donno why a lot of ppl carry canon. but for myself, im carrying nikon d7k. my fren of mine who had his d300s for 2 years, he said nikon hv much improvement towards the body when he touched the d7k. well, i juz speechless coz this is my first dslr.

Nope. 70-200 sleeps at home. 24-70 on D300 is tight enough already for that environment.
Besides, the temple was very very crowded, bro. When I was moving between the crowds, the D3s swings with the 17-35 mounted and hit a few people already. I have to apologize to them.

Imagine 70-200 instead...

nikon system somehow got more user friendly features than canon i think. maybe canon are ahead in its video mode, but nikon's ahead in some ways too. like some forumer here said that the 5d2's 21mp creates more noise at higer ISOs vs D700, i took a look at that, and nikon's 12mp wins. they're not in the mp race because they know wut they're doing. and nikon's flashguns are also way ahead from canon. i was told about this yesterday . nikon's entry level dslr oso got some features that somewhat can be useful. i tried my fren's d5000 and it can set up min shutter speed and max ISO when ur taking in AV mode. and about canon being cheaper at higher end glasses, i dont have any idea cuz i never bothered to check on nikon's. but here, the canon 70-200 f2.8 IS II is about £2000, and the nikon's VR II is just about £1600. i guess nikon's is cheaper. that's what i read in a magazine anyways. n the battle of FF 5d2 vs D700, got 2 of my frens who switched from canon to nikon and i never bothered to ask bcuz im in love with my cam. but it bothers me last night so i google it and i ask them as well. better AF system, better noise performance at higher ISOs, better burst rate, can use DX lenses for 5mp, and they said there's a built in flash which all these features is not available on canon 5d2.

well, to say which system is the best, its kinda hard. i choose canon cuz its the first dslr i own n i know how to maneuver it already. and i have no problems with it so far. pick ur pick then. but if u choose either any system, it wont disappoint u. unless ur a pro, then u should know which one will serve u best.