Very nicely started, Kryndal.
The feats are amazingly powerful, but I suggest a sortof different variation:
For Elder Tongue, don't make it metamagick but simply a feat stating that you get +2 on your caster level checks to overcome spell resistance whenever using any spell that has a V component.
For Elder Tongue I, I suggest a prerequisite of having at least 2 metamagick feats. Instead of giving a metamagick feat to the spell for free, and for balance's sake, I suggest instead giving the caster a bonus (that stacks with Elder Tongue) on his caster level checks to overcome spell resistance whenever using any spell that has been metamagicked with a V component equal to the number of levels added from metamagic feats by the spell. (Aka, casting a 6th level equivilant maximized fireball would grant you a total of +5 to your spell penetration roll, 2 for Elder Tongue +3 for maximizing a spell with Elder Tongue 1, and an additional +2 if you had Spell Penetration)