I have to admit, I am quite addicted to sexing chickens by appearances. I am not into feather sexing day olds, or vent sexing - as I breed my own birds and feather sexing is very precise. You have to keep two lines of chickens, using fast feathering males and slow feathering females. Since I have no idea how to determine if the birds I presently have are fast feathering or slow feathering, I'll stick with the visual sexing guides only 
Also, vent sexing.. Just don't feel comfortable with it personally.
Comb Sexing:

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Single combs (note wattle buds in 3 week old male to the right) Males pink up early, where females often times stay peachy until they are older.

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Leg Width:

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Leg Width Sexing does not work for all breeds.. Naked Necks are especially easy to sex this way (at least my line).
Colour Sexing

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If you are buying birds over 12 weeks at a sale, check out these very clear differences between mature cockerels and pullets:

click to enlarge
(Note: Not all hens will have 'small' combs, but they willalways almost always be smaller than the rooster's.)

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Sexing crested breeds such as Houdans and Polish can be done later on by their crests if you can not yet see the cockerel's pointy saddle/hackle feathers. By 12 weeks old the crest is noticeably different between the two sexes. Cockerels look like rock stars and pullets have a round afro.

click to enlarge
Silkie sexing.. One of the hardest breed to sex. Especially for those new to the breed. The roosters aren't always clear and sexing tips I have given you previously won't always apply. Often times males have very tiny combs. Not much larger than a pullet. Their hackles and saddles are longer - but not always obvious to someone buying a Silkie for the first time.
The biggest give away that you have a cock bird is by their crest.. Males have whisps of feathers coming out of their crest. I find the males look like they have mullets - business in the front, party in the back.
I hope this helps you in your sexing attempts.
If anyone has any clear pictures of breeds that can be colour sexed that I have not already included in this post, and would like me to edit and share in this article, I'd be grateful. I would love to have a collection of images for others to reference back to when trying to sex their own birds, or trying to help others.
Feel free to repost any of these images so long as they are not edited in any way.

Also, vent sexing.. Just don't feel comfortable with it personally.
Comb Sexing:
click to enlarge
Single combs (note wattle buds in 3 week old male to the right) Males pink up early, where females often times stay peachy until they are older.
click to enlarge
click to enlarge
Leg Width:
click to enlarge
Leg Width Sexing does not work for all breeds.. Naked Necks are especially easy to sex this way (at least my line).
Colour Sexing
click to enlarge
click to enlarge
If you are buying birds over 12 weeks at a sale, check out these very clear differences between mature cockerels and pullets:
click to enlarge
(Note: Not all hens will have 'small' combs, but they will
click to enlarge
Sexing crested breeds such as Houdans and Polish can be done later on by their crests if you can not yet see the cockerel's pointy saddle/hackle feathers. By 12 weeks old the crest is noticeably different between the two sexes. Cockerels look like rock stars and pullets have a round afro.

click to enlarge
Silkie sexing.. One of the hardest breed to sex. Especially for those new to the breed. The roosters aren't always clear and sexing tips I have given you previously won't always apply. Often times males have very tiny combs. Not much larger than a pullet. Their hackles and saddles are longer - but not always obvious to someone buying a Silkie for the first time.
The biggest give away that you have a cock bird is by their crest.. Males have whisps of feathers coming out of their crest. I find the males look like they have mullets - business in the front, party in the back.
I hope this helps you in your sexing attempts.
If anyone has any clear pictures of breeds that can be colour sexed that I have not already included in this post, and would like me to edit and share in this article, I'd be grateful. I would love to have a collection of images for others to reference back to when trying to sex their own birds, or trying to help others.
Feel free to repost any of these images so long as they are not edited in any way.
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