Xeric Design today announced the availability of EarthDesk 3.5.3, the latest version of the real-time dynamic desktop map for Macintosh Intel and PowerPC systems. EarthDesk displays city lights, hurricanes and worldwide weather systems on your desktop. Version 3.5.3 adds support for portrait (vertical) displays and fixes several minor bugs. As an introductory offer, through July 15th, EarthDesk may be purchased for US$12.95 –a 35% savings off the normal price of $19.95.