Prestige Classes:
Blade of Orien: 6th level earliest entry (w/ Dragonmark Heir, 7th otherwise). Good BAB and Reflex. Battle uses of teleporting. Not unbalanced to me. YES
Cyre Scout: 4th lvl earliest entry (ranger, druid, or scout), Medium BAB, Good Fort/Will, gains some infusions. Odd, but not unbalanced. YES
Silver Key: 4th lvl entry (dwarf rogue), Med BAB, Good Ref/Will. The SR does seem a bit powerful. NO
Feats;
Dragonmark Adept: Not a single one of these spells has been approved IIRC, so approving the feat would be less useful. No Vote.
DragonMark Battle Strike: Fine. YES
Orien battle Stride: Its not a full move action, its only a 5' move, but it is unlimited. It does specifically mentions "opponent" not "attacker", which *should* rule out RA's trick (the pair are allies). I vote YES as it is, but will also support explicitly wording it so it applies to non-allies and/or limiting the movement.
Quicken Dragonmark: YES
Spells:
Dancing Dragonmark: YES
Fortify Dragonmark: YES
Ignite Dragonmark: YES
Mask Abberant Dragonmark: YES
Ray of Retaliation: YES