Correct, Lithium-Ion and Lithium-Polymer doesn't need, and you don't have to wait till the battery goes low before charging. In fact, it is very important NOT TO drain the battery empty (although it won't empty because it will still keep some charge, that's why you still can on it after it auto-off, but doing so, you risk damaging the battery).

Long ago, when phone battery changed to Li-Ion, I didn't know about it, and my always let my phone battery auto-off, then I tried to on it again sometimes, and it frequently auto-off. One day, the battery can no longer be charged, it was just right about after 6 months (just nice the warranty ends for battery), and it was a motorola rare phone. Did some research and found out about Li-Ion battery... Learnt my lesson, expensive one as only original battery available.

You can read up more on Li-Ion and Li-Poly; it's not like the olden days battery. Plus, there is a test whereby they test 2 similar phone (new) and with different charging style, 1 which only charge when the battery is low, and another is always charge as needed. The result? The one that always charge as needed proven to have better performance, as in it last longer.
Same goes for my PSP, I don't wait until low batt only I charge, while my friend does this, he always plays until there's no battery or low battery only he charge. One day, we went for multi-play, both fully charged, half way playing, his battery low warning comes on, my battery still has 2/3. After that, he followed my advice, seems the battery performance has indeed improved. These are what I tested and found out myself.

I think I saw one of the shop in MidValley have the D7000 version. If I'm not wrong, it should be the one near center court, beside the escalator.

Didn't see in detail, just saw the thing for D90 and another I think should be D7000.
You can try call and ask to confirm.

group picture depend on the depth, then dial in the appropriate aperture.
If the group is big with 3 or more rows, you can focus on the middle row and dial in smaller aperture to get more in focus.

DOF does not mean focus one area, it means the 'depth'.

If you dial in smaller aperture (bigger f number) you'll let in less light thus your picture will be darker, so you ned to compensate with slower shutter and/or increase iso.
If your camera have depth of field preview button, try to dial in wide paerture (small f number), press the DOF preview button, take a look at your lens, you'll see the aperture wide open thus letting in much light.
Now change your aperture smaller (big f number), press the DOF preview button and see again...

This post has been edited by Andy214: Dec 27 2010, 04:53 PM

Depends on the group, how they stand, the lighting condition.
Aperture f2.8 ~ f3.5 should work well 'generally', but depends your term of 'general' also.
For wedding dinner, say a group of friends standing in the SAME row or say 2 rows, it should work out fine at f2.8 or f3.5, shutter speed 1/80 or 1/125 at iso around 1600 maybe (just wild guess), You have to try out to see the result.

If you're talking about big group of people with multiple rows and poor lighting, then thats different story lah