Although it has nearly nothing on "aiming", I suggest getting the DVD "Masters of the Barebow, Volume III". It features two world champion archers, and they show their shooting technique.

Consistency is the key. Even if you hit high and right, if you do that every single shot, you can adjust from there. If you are all over the place, you can't adjust.

I havn't read it (yet), but "The Simple Art of Winning" by Rick McKinney (Olympic champion) gets great reviews.

There's lots of entertaining books and videos on the market, but IMO some can do you a lot more harm than good. Some are a mixture of accurate information and complete bull.

Chad