Yes, all Atheros chipsets have these advanced features.

"Monitor mode" is not the same as promiscuous mode. "Promiscuous" mode accepts packets from any host on the same wireless network, whereas "Monitor mode" allows you to intercept packets for other wifi networks, including ones your card isn't associated with (providing they're on the right channel, strong enough signal etc).

Atheros chipsets can behave as several "Virtual interfaces" at once, allowing you to associate with an AP (in the normal way) and simultaneously sniff packets in monitor mode. Few other chipsets can do this.

Injection is also supported by the Atheros (madwifi) driver on interfaces in Monitor mode.

See the madwifi docs for more information.

Atheros chips really are the best for wifi diagnostics / cracking applications, fortunately they are also common and cheap.

Slarty