One of two new Belkin neoprene armbands for the iPod touch is the Sport Armband Plus ($30), a blue and red alternative to the black standard Sport Armband. Both designs feature a small key pocket, but Sport Armband Plus uses a new armband design that relies on a metal pin for adjustment, and will include a band-mounted, detachable Cable Capsule (not shown) to help you wrap and store earbuds and their cables when they're not in use. A slit on the bottom…