If your implement belongs to a Weapon Group (Heavy Blade, Light Blade, Staff, etc) it is a weapon too.
Thus it can carry weapon enhancements and be effectted by weapon damage feats.
I play a Spiral Tower Wizard and as such my implement is a longsword - I can only enchant it with Heavy Blade usable magic effects, but I get to use those effects as much as if I was using the sword to melee with (unless a given enchantment states it only effects melee attacks/Weapon powers).
Thus it can carry weapon enhancements and be effectted by weapon damage feats.
I play a Spiral Tower Wizard and as such my implement is a longsword - I can only enchant it with Heavy Blade usable magic effects, but I get to use those effects as much as if I was using the sword to melee with (unless a given enchantment states it only effects melee attacks/Weapon powers).