Dantz Development today announced that Retrospect 5.1 for Macintosh is now fully compatible with the new line of Power Mac G5 desktops. A free updater is available on the Dantz Web site. Retrospect 5.1 for Macintosh is available in three editions: Retrospect Server (US$799.00, $159 upgrade, Retrospect Workgroup ($499.00, $99.95 upgrade), and Retrospect Desktop ($129.00, $59.95 upgrade.