Helium Balloons lets you send a virtual ballon into the sky. Depending on size and your current position it travels according to real (!) meteorological conditions (wind speed, wind direction, etc).
Connect to Facebook to leave your identity on the attached card, or just your e-mail address, together with a message and photo to let the recipient get in touch with you.
Browse the map to pick balloons nearby your current position or track flying balloons. Landed balloons are labeled with the date they were sent and the distance they travelled, together with the average speed. See more info about the sender and get in touch with her/him on Facebook or send an e-mail.