PC World reviews NEC's LT265 with 802.11g connectivity: The reviewer says it's not a bad projector, but the complexity of setting up a wireless connection are frustrating. Still, once the details are worked out, the LT265 provided good remote projection and control for $2,500 device. The projector can control a PC, and a laptop can project to multiple projectors.
The reviewer notes that NEC recommends its own, very expensive 802.11g card to use with a connected laptop, and doesn't offer tech support for other 802.11g products. The device can only support 802.11b connections through an ad hoc hookup; an 802.11g router is required for that level of performance from a remote laptop.