Got this from a RIM employee, seems like their syncing software is developed by Intellisync. Intellisync is the leader in syncing software and has some big name partners including RIM, AOL, Palm, Microsoft, etc.
RIM currently does not offer a Mac version of the Desktop Software. To deliver synchronization of calendar, address book, tasks, and memo pad, RIM licenses Intellisync software from Intellisync Corporation. At this time, Intellisync does not offer a Mac version. There is currently no timeline set for the introduction of Mac versions of Intellisync or the BlackBerry Desktop Software.