This isn't quite as awesome as I thought it would be when I read the title, but it's definitely closer to filling some gaps I feel still exist in the system. I really like Arcane Mutterings, Eyes of the Delver, Practiced Rider, Fast Hands and Improvisational Arcana - interesting powers that aren't just numeric bonuses or a couple squares of movement. Cry for Mercy, Crowd Cover, Slow Pursuit and Confusing Blather are good as they are, but seem like they should have some out-of-combat utility as well.
This is also where you would put metamagic powers, I think.