Isn't localhost simply 127.0.0.1 on Mac OS X 10.7 (Lion)?
127.0.0.1 is the (IPv4) localhost you are used to.
::1 is the IPv6 localhost address.
fe80::1%lo0 looks like a link-local IPv6 loopback address on the device lo0.
::1 is IPv6 equivalent of 127.0.0.1
fe80::1 is link-local IPv6 address (one per adapter).