If you own a Samsung phone or tablet, there's a good chance that you've heard of Kies, Samsung's proprietary synchronization software. If you're also a Mac user, I'd be willing to bet that you're familiar with the frustration of Kies' Windows exclusivity.
Good news, though - the days of booting into Windows just to sync some data or grab an update are over, as Samsung finally released a version of Kies for Mac. Beware, though - this software is beta, so you'll probably experience some bugs. Also, the initial version only supports two devices: the Galaxy S II and the Galaxy Tab - so if you're not holding one or the other, you'll have to wait for Sammy to push an update that supports your device.
It may not be perfect, but it is a step in the right direction. You can grab the download here.