Must be a regional thing. Pony cans are not uncommon around here, and neither are 8oz bottles.
EDIT: BTW, they seem to encourage fast drinking.
Had a few great ones on vacation last week: Rogue John John (Juniper and finished in Gin barrels), Rogue GYO (black ale brewed with all self-grown ingredients), Dogfish Head Black and Blue (blackberry and blueberry), Dogfish 90 minute IPA (on draft at Amen Street in Charleston), Stone Sublimely Self-Righteous Ale, and the New Belgium Ranger IPA. All were fantastic. The John John and Black and Blue were truly incredible.