You want the best archer class? check out the core class "Scout" in the AEG Mercenary book. bab of a fighter, 1d6-10d6 ranged sneak attack, and oh did I forget to mention the 7 bonus feats and 6-7 other special abilities along the way?
not too shabby. damn....
Peerless Archer->silver marches
Deeep wood sniper->Masters of the wild
Order of the bow Initiate->Sword and Fist
The Heartseeker->Dragon 296
Blood Archer->Evil from AEG
There is no PrC called the Zen Archer. Some people use it to describe the Order of the Bow Initiate, which has a Zen Archery ability. Hong felt it really didn;t capture the spirit of Zen Archery (and it doesn't), so he designed his Master of Intuitive Archery as a Zen archer.
Speaking of Three Arrows for the King... anyone gotten it yet? What think you? Classes good? Balanced? Interesting and useful? Equipment good? Feats good? Worth getting if you are playing an archer-focussed class? }