Not uncool: a camera with wireless LAN. And the large display is certainly not impractical either. Something like this could appeal to me for on the go: simply shoot pictures and send them off. However, only via appropriate WLAN hotspots - those are rarely to be found outdoors in nature where I prefer to photograph
If the camera had Bluetooth and could connect via a Bluetooth phone over GPRS, then it would be pretty perfect as a digital notebook.