Most of the buzz about XM Weather relates to the Nexrad weather radar mosaic and lightning display. That is as it should be. The other items, the metars, TAFs, airmets, sigmets, winds, freezing levels, synoptic pictures and more, are and have been available elsewhere. Many of these products have a relatively long life and can be obtained before takeoff. When flying, the metars, TAFs and convective sigmets are readily available by calling an FSS or, in the case of metars, by listening to ATIS, ASOS and AWOS broadcasts. But the radar picture you look at before takeoff is guaranteed to change and XM Weather brings those changes to the cockpit.