Windows Phone Thoughts: How-To: Several Storage Cards - Same App Installed

"I often receive questions about the possibilities of installing the same application on more than one memory card to be used on the same computer. An example: you’d like to use, say, the excellent Resco Picture Viewer to review all your shots on your (several) memory cards you use in your digital camera but you wouldn’t like to install it in the main storage of your PDA to save memory (or to avoid for example filesys.exe compactions). You can safely install, in this case, Resco Picture Viewer on all your memory cards also used by your digicam. Whenever you insert any memory card that also has the viewer installed on it, you’ll be able to start it right from there."

Simple and effective, Menneisyys provides a nice write-up on keeping your multiple storage cards living happily together. I know I've swapped storage cards many times in the past (one for music + needed apps, one for gaming + needed apps, etc...), and had to learn much of this by trial and error. If you're new to the PPC Storage Card world, check it out (Or if you're a veteran, see if there's anything you missed!).