back stall = toss up, bend down fast enough that it rests on your neck/upper back
elbow pit = toss, and when you catch it, it gets squeezed between the upper and lower forearm
elbow = toss, and catch on side of elbow (think chicken wing)
stomach = ??? bend backwards?
kneepit = catch in the pit of the knee. somewhat similar to elbow, but the method is different
if you visit krakan's server, there are some tuts there by ChennehCis and Windsen

There is also a neckstall where you catch it between you chin and shoulder.

it's good to learn the stalls, but there's also many other things that you could do with glowsticks. also i suggest experimenting with the behind the head catch, behind the back catch, behind the back toss, under the leg toss, under the leg catch. those are some basic tosses/catches.

Sticks already are balanced. When tossing them flat, they don't tilt, unless they have something heavier on the side. Its because of the liquid sloshing around. Whenever doing a heli toss, if you pay really close attention, there always is an air bubble, and the liquid goes to either end. This demonstrates that it is balanced (unless the liquid has been emptied to make a photon stick).

Not only is it bringing the body part down at the same speed as the stick (technically impossible as falling objects accelerated around the rate of 23m/s (can the muscles even cause a limb to go down that fast?)), but slowing it down gradually. This way, the body part 'cushions' the stick, and slowing down to a stop = good stall, as the stick won't bounce off.

Just want to clarify for the new people who don't know how to stall.

for working on stalls something i found to be very helpful:

start off with the stick on the back of your hand and practice moving your hand up and down with the stick on it. This will give you a feel for the weight and the speed of the stick as it falls - over time you'll be able to move the stick higher and higher off your hand and still stall it properly - this can be practiced with almost anything, anywhere since all things fall at the same rate

stall require a ton of practice to get down flawless, but once you do it will open up the doorway to beat catching and stalling, different shadow tracing possiblities [shadow trace - moving your body around the stick while it stays "still"], and also more combo options since a stall could be thrown in anywhere at anytime during your "set"

my "sets" are very stall heavy - i'll usually start or end a series of combos with a stall, plus beat catching and stalling is a great way to keep momentum going, while saving your energy for another round of sticking

PS
the sticks fatter ends do cause them to be a lil off, but only a very tiny amount, a heli toss spin dramatically cuts down on the effects of the weighted end, but its easier to just adjust your hand to get the stall proper

i never go straight from holding the stick to a stall... i find that if i go from a hand stall INTO another stall, it's easier to position the stick the way i want, i.e. no awkward angles that would cause the stick to bounce out of the other... other than that, follow EVERYONE ELSE'S ADVICE

-CS