If you have a Windows Mobile device (a Motorola Q or Treo 700W, for example), go to http://www.google.com/gmm on the mobile web browser and install “Google Maps Mobile.” It’s a special version of Google Maps optimized for a mobile phone, including street maps and satellite images, driving directions, and real-time traffic reports for folks in big cities.
Google also just announced an interesting addition to its Picasa program – it’s possible to use “Picasa Web Albums” to store photos online, then view them on a Windows Mobile device at http://picasaweb.google.com/m. The pictures are automatically resized for a handheld screen. (Flickr has a crude version of the same feature – Flickr users can see their photos on a handheld device at http://m.flickr.com/. Expect many more sites to be optimized for handhelds soon.)