Imagine your students emailing home an epostcard from a virtual field trip! Use Google Earth and interactive virtual field trip sites to journey to a place you've been reading about or studying. Then, have students use images from that location to "write" home about what they have seen and learned.
Check out the app called PhotoCard by Bill Atkinson. It's FREE! You can even record a voice message to go with it! E-mailing is free. If you want your post card printed and mailed in a hard copy, there's a less than $2 fee in the U.S. Not bad!