I like it. It's nice that it's no longer an ECL 7 race.
I like that Fey Resistance and Natural Magic are tied to your character level, so your racial benefits improve as you do.
Why do they get scent? It's not something the 3.5 version had, and maybe I just don't know much about goats, but their sense of smell never struck me as a notable feature.
Arcane Spirit is very cool, and while a Satyr Wizard doesn't seem as "natural" as a Sorceror, this lets the player choose without hindering power.
Darkvision good, but why no low-light vision?
Woodland Stride is fitting. Nothing else to see here.
Natural Magic is an interesting choice. 3.5 didn't give satyrs any SLAs, but I'm assuming this is a trade off with the headbutt, and to help them be more mystical fey creatures, and a little less physical..yes? Or was there another reason entirely for giving them some SLAs?
And by-the-by, I do like the way you have racial abilities powered by charges. An idea might be to have them gained at every even level, to help stagger them with feats, since otherwise you'll be getting a new feat and a new charge at the same levels...unless that was intentional?
Oh, and don't forget to update your main D20 Rebirth thread with a link to the satyr!