The Archery Mod that ostensibly Bethesda will adapt features from to use in SkyRim
(Go to the mirror section to get more information and to download the mod files.)

Get it here:

http://tesalliance.org/forums/index.php?/files/file/514-duke-patricks-combat-archery/

Some of my Combat Archery mod features:

Much more damage

System helps to prevent NPC from shooting their friends in the back!

Reactions from NPC when their friends are hit with an arrow.

Bow sway if you are in zoom sniper mode, but you can also hold your breath to stop it!

Moving around will make you miss (shoot off the cross hair) a lot. With bobbing bow sway effect that visually tells you when momentum is no longer effecting your shot after moving.

Reduced speed moving backwards.

Stronger bows will take much longer to draw the arrow then weaker bows depending on your strength.

Aim your bow straight down to the ground to denock it!

Quiver Capacity limit for actors and the player.



Skyrim new archery mechanics per various media sources:

Much more damage

System helps to prevent NPC from shooting their friends in the back!

Reactions from NPC when their friends are hit with an arrow.

Bow sway if you are in zoom sniper mode, but you can also hold your breath to stop it!

Moving around will make it harder to hit your target (not sure yet how, I have not read any specific details on that part.)

Reduced speed moving backwards.

Stronger bows will take much longer to draw the arrow then weaker bows.

Arrow denock button!

Much more limited Ammo.



For the most advanced SCA combat with sword and shield:
http://www.spookyfx.com/book/tromp.html