Amino Acids are the basic components of protein.
Some are essential and others can be formed in the body. The branched-chain amino acids (BCAA's) are the most important for muscle recovery, along with glutamine.
Here is a great link explaining amino acids and recovery

Essential Amino Acids
Leucine (BCAA)
Isoleucine (BCAA)
Valine (BCAA)
Lysine
Methionine
Phenylalanine
Threonine
Tryptophan

Non-Essential Amino Acids
Alanine
Arginine
Aspartic acid
Cystine
Glutamic acid
Glutamine
Glycine
Histidine
Hydroxyproline
Orinthine
Proline
Serine
Taurine
Tyrosine

creatine phosphate is made from three amino acids: arginine, methionine and glycine

$44.00
Animal Nitro
44 paks (264)
BCAA's
Methionine, Phenylalanine, Threonine, Lysine,
~~Tryptophan~~
Arginine, Histidine,
>Free-Form AA's

$28.00
Amino Armor
252 grams (193)
BCAA's
Methionine, Phenylalanine, Threonine, Lysine,
~~Tryptophan~~
Alanine, Glutamine,
Glutamic acid, Taurine,
Histidine, Arginine,
Orinthine, Beta Alanine
>Free-Form AA's

$28.00
Amino Armor
270 caps (193)
BCAA's
Methionine, Phenylalanine, Threonine, Lysine,
~~Tryptophan~~
Alanine, Glutamine,
Glutamic acid, Taurine,
Histidine, Arginine,
Orinthine, Beta Alanine
>Free-Form AA's

$24.00
Power Shock
350 gr (280)
BCAA's
Methionine, Phenylalanine, Threonine, Lysine,
~~Tryptophan~~
Histidine, Beta Alanine, Citruline, and amino nitrates
>Free-Form AA's

$21.00 EAA Stack
250 gr (210)
$71.00 EAA Stack
1000 gr (810)
BCAA's
Methionine, Phenylalanine, Threonine, Lysine,
~~Tryptophan~~
Arginine, Histidine,
>Free-Form AA's

$19.00
BCAA 5050
300 gr (293)
BCAA's

$25.00
BCAA 2200
400 caps (220)
BCAA's

$21.00
Recoup 345 g (291)
$53.00
Recoup 1035 g (873)
BCAA's, Glutamine
Citruline, B-vitamins

$20.00
Super Amino
450 caps (538)
BCAA's
Methionine, Phenylalanine, Threonine, Lysine,
Tryptophan, Alanine, Histidine, Arginine, Glycine, Proline, Serine, Cystine, Glutamic Acid, Aspartic Acid,
>Protein & Free-Form AA's

$48.00
A-Bomb
224 tabs (252)
BCAA's - HMB
Phenylalanine, Alanine, Alpha-Ketogluterate,
Glutamine, RNA, Beta-Carotene

$32.00
Modern
BCAA
428 gr (350)
BCAA's 8:1:1
Glutamine

Most amino acid powders do not immediately blend together when you mix them. They foam up or look like a snow globe. However, after a few minutes most mixes will settle down and blend together.
You can mix the powder in a few ounces of warm water to disolve it faster, then add cold water after it is mixed together.

$26.00
Xtend 390 g (285)
$63.00
Xtend 1070 g (855)
BCAA's, Glutamine
Citruline, B-6

$19.00
BCAA Stack 250 g (194)
$54.00
BCAA Stack 1000 g (776)
BCAA's, Glutamine

$9.00
Maximum Amino
100 caps (50)
BCAA's
Methionine, Phenylalanine, Threonine, Lysine,
Tryptophan, Alanine, Histidine, Arginine, Glycine, Proline, Serine, Cystine, Glutamic Acid, Aspartic Acid,
>Soy Protein

Amino Acids are needed Immediately after exercise when your muscles are especially receptive to nutrients and the blood flow to the exercised muscles remains high. Free form amino acids move quickly through the stomach and into the small intestine, where they're rapidly (within 15 minutes) absorbed into the bloodstream. 4 grams of aminos exceeds your liver's capacity to absorb and store them, so the extra aminos continue in the blood go direct to the tissue that needs them - your post-workout muscles.
Mario DiPasquale's book "Amino Acids and Protein for the Athlete"(right) explains why you do not need to spike your insulin with sugars to absorb amino acids after a workout because at that time your muscle are "insulin sensitive"
However, according to Author Rea and Eric Broser in "Building the Perfect Beast Naturally", you need quick carbs after heavy training depletes your normal blood glucose levels. If not, your catabolic hormones glucagon and cortisol will break down muscle for conversion into the needed glucose. They suggest 40 grams of protein, 10 grams of glutamine, 10 grams BCAA's, and 40 grams of waxy maize which is supposed to supply glucose without the insulin spike. (Read pages 61 through 67)

Glossary of Nutritional Terms
(A-D) (E-L) (M-R) (S-Z)

Glutamine is the most abundant amino acid in muscle and plasma. It is produced in your muscles, combining ammonia and the amino acid glutamate, and makes up more than 60% of the free amino acid pool in muscle cells. A high glutamine level in the muscle cells stimulates the entry of other amino acids, along with water. Overtraining depletes your body of glutamine to the point that you can't efficiently recover.
Glutamine, along with the BCAA's (leucine, isoleucine, valine) should be taken before, during and after lifting weights
read this great article on glutamine

$20.00
BCAA 6000
180 tabs (180)
BCAA's 4:1:1

$24.00
Amino Decanate
360 gr (315)
BCAA's 10:1:1
Methionine, Phenylalanine, Threonine, Lysine,
Tryptophan, Alanine, Histidine, Arginine, Glycine, Proline, Serine, Cystine, Glutamine, Glutamic Acid, Aspartate, Asparagine, f
>Free-Form AA's

$22.00
Atomic 7 412 g (315)
$57.00
Atomic 7 1124 g (860)
BCAA's, Glutamine
Citruline, B-6,Taurine

Atomic-7 same as Scivation Xtend - plus Taurine

Atomic-7, Xtend , Recoup, BCAA Stack, - very similar profiles and price

$21.00
Amino-X
435 g (300)
BCAA's
Alanine
Taurine

$23.00
BCAA
400 gr (400)
BCAA's

$35.00
Glutamine
552 gr (480)
Glutamine, BCAA's
(high glutamine)

$39.00
Mass Amino
500 tabs (500)
BCAA's
Methionine, Phenylalanine, Threonine, Lysine,
Tryptophan, Alanine, Histidine, Arginine, Glycine, Proline, Serine, Cystine, Glutamic Acid, Aspartic Acid,
>Milk Protein