5MB seems high, so you should consider yourself lucky, I suppose. You must remember that the physical layer limit of 11g is 54Mbit, not 100. And with 802.11, it is expected that one should get half that maximum (802.11 has it's own chattiness).

I have pushed large files over to my N800 via wireless (and scp), but I usually time it so that the amount of time it takes is not a problem (start the transfer just before dinner, for example).

I think you are seeing what pretty much everyone else is, in terms of transfer speed.

Craig...