Windows Network Projectors? Anyone used them, or know of a good one?

At our business there is interest in getting a 720P projector, that is
capable of taking a 1680x1050 resolution from a laptop, but that can
work with hard ethernet cables or maybe even 802.11N..

IE: the goal is to be able to plug in any laptop to an ethernet
cable, which can then connect to the network projector. In most cases
they all have Vista, which as the network projector connection icon as
well, there may be one rare case of XP, but if the network projector
doesnt support XP that wouldnt be bad.

Ideally it could work via wireless.. wireless N, i'm assuming, for
best support of streaming videos being displayed.

Most of the things displayed would be power point presentations, but
there could be a rare video here or there.. i would think N would be
fine for that as well.

I havent found many that would be able to do this..

Can anyone point me to a few windows network projector models that may
work like this? Or can you take a standard projector and add on the
wireless or network adapter to make them work like this?

Thanks in advance