SD WiFi cardOne of the big downsides to having only a single expansion card slot in your PDA or smartphone is that sometimes you have to choose between using a memory card or adding an attachment like a GPS receiver or a WiFi card. Addressing that problem is SanDisk's new 802.11b SD expansion card that comes with 256MB of memory built-in. And, oh yeah, this only works with Pocket PCs, so don't bother trying to use it with your Treo 600 (or any other Palm). A driver for Palm handhelds isn't expected for several months.