PVE Frost (21/0/50) (Patch 3.3 spec)

Best PVE Frost Spec

Use Frostbolt until you get instant Fireball procs.
Icelance will hit much harder now too so it is also an option against frozen targets.
Major Glyphs: Glyph of Frostbolt - Glyph of Icelance - Glyph of Mana Gem
Minor Glyphs: Glyph of Slow Fall - Glyph of Frost Ward - Glyph of Fire Ward
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PVP Frost (20/0/51) (Patch 3.3 spec)

Best PVP Frost Spec

Frost for pvp is the mages most popular spec.
You will have great burst and a lot of CC and survivability.
Major Glyphs: Glyph of Polymorph - Glyph of Evocation - Glyph of Ice Barrier
Minor Glyphs: Glyph of Slow Fall - Glyph of Frost Ward - Glyph of Fire Ward
Check out this guide on how to make tons of gold without getting banned.