Ignoring for a moment how annoying it is to have all the key sockets located back there, it's a pretty good selection of ports: in addition to two USB openings, it has Thunderbolt and full-sized HDMI sockets, both rarities for Ultrabooks (heck, Thunderbolt ports on PCs are rare, period).
ENGADGET: Acer Aspire S5 review: is this innovative Ultrabook worth $1,400?