Mark/Space has announced Missing Sync for hiptop, new software that enables users to connect and synchronize information between a Danger hiptop (e.g. T-Mobile SideKick, SunCom hiptop, Fido hiptop) and Mac OS X. According to the developer, Missing Sync for hiptop uses Apple’s iSync and synchronizes iCal calendar events, to do items, and the Mac OS X Address Book contact information with the hiptop online Desktop Interface which is wirelessly transferred to the hiptop device. Missing Sync for hiptop will be available by the end of February for US$29.95.