This Friday Apple will ship Mac OS X 10.6 Snow Leopard, and Spanning Sync is ready.
Spanning Sync 3 is fully compatible with Snow Leopard and takes full advantage of its support for 64-bit processing. (And for those of you with an eye for the technical details, the Spanning Sync pref pane is now garbage-collected.)
We've been using Spanning Sync 3 on Snow Leopard for over a month with no issues, as have a number of our users.
Of course, Spanning Sync 3 is also compatible with Leopard. Mac OS X 10.4 "Tiger" users should continue to use Spanning Sync v2.1.3, available from spanningsync.com/tiger-download.