I believe they removed the level restriction on tradeskills.
EDIT: Actually, 3.0.3 looks to have removed the level restriction on gathering skills, crafting skills still have em. Explains why the first world 450 achievements were on fishing and skinning.
Edited, Nov 13th 2008 12:44pm by Tsarducci
EDIT EDIT: 65/350 is the chracter level/skill level for crafting professions to be trained to GM, according to wowwiki
Edited, Nov 13th 2008 12:46pm by Tsarducci