My personal split on my Thrower atm is 12 bard 6 ranger 2 rogue, for +2 stat song, displacement and trapping skills. Before this version it was pure ranger thrower (pretty decent) and before that it was 16 alch 3 wiz 1 barb
Feats too pick up if only going 6 ranger (and no alch):
Point Blank shot
Simple Thrown Expertise
Multitude of Missiles
Imp crit thrown
Improved Precise Shot
2 free feats for you too decide on heroic
Combat Archery
Overwhelming Critical
Blinding Speed ( I did not pick this, dont seem to do anything if you are using Whirling Wrist and have a Haste item on. But did not do a complete test)
Doubleshot
Holy Strike (if no room for ghost touch)
Harbinger of Chaos
Epic Reflexes (if you want/need)
ED = Shiradi
Twist = Martial Hymn T4 , Meld T3 , A Dance of Flowers T1 , First Harmonic Chord T1 , Extra Action Boost T1
Sorry for messy post :P