Increases the range of your Fire spells except Frostfire Bolt by X yds.
Flame Throwing is a mage talent that increases the range of Fire spells (but for Frostfire Bolt) by 3 yds per rank, up to 6 yds at max rank 2. This talent is useful in most every PvE and PvP build that makes primary use of Fire spells. This talent is especially useful for Fire Blast, which has a fairly short range.
Similar mage talents exist for other spells schools - Arctic Reach in the frost tree extends the range of Frost spells, while Magic Attunement in the arcane tree extends the range of Arcane spells.