RedMoonValley and TreePath/Tao town was 1.2 (All rare items were put into the shops and everything c0ck3d up and resulted in a major rewind).
1.3 brought the new boars and omas sounds. (if im not mistaken the ExTokens were brought in at this point).
1.4 brought all the prajna island amd prajna temple 3new spells. (TDB, EnergyRepulsor + FrostCrunch )
1.4i brought the insect cave and mineral mines.
1.5 brought new items belts/shoes + stones. new spells (flame disruptor, CHM + ultimate enhancer)
1.6 were new lvl 40 armor skins. (i think) And BlackDragonDungeon cave.
1.7 brought in PB and PastOmas. new spells (mirroring, Lions roar + HolyDeva) and EvilMir.
1.8 patch introduced the crafting NPC and new potions (XL) mp and hp pots.
1.9 gave us 3new spells (FlameField, Blade avalanche + Curse) . (ExToken NPC "Diapolon" was brought in to remove the tokens and compensate the players with lvl 37+ items and holyssotnes/benes etc...) As well as the permenant addition of the OmaKingSpirit cave (i think).
2.0 gave us mail system, lvl 48 armor, ultimate challenge system. and 3new spells (vampirism, entrapment + hallucination)
That's just a rough guide - i may be wrong with some of the spells etc - but 1.2 was deffinatly when shops were buggered and spidercave / tao village was introduced.