Some terminology...
IEEE 802 = a set of standards for local area networks (LANs).
IEEE 802.2, 802.3, 802.3U are networking protocols/ standards but not wireless standards/protocols.
IEEE 802.11 = a set of wireless LAN standards/protocols.
802.11a - operates at 5GHz, data rates up to 54 Mbit/s but not widely adopted.
802.11b - operates at 2.4Ghz, data rates up to 11 Mbit/s and widely adopted (although slower than 802.11a it typically has better range)
802.11g - operates at 2.4Ghz, data rates up to 54 Mbit/s and likely to become widely adopted since it is fully backwards compatible with 802.11b.