We are currently beta testing an app that will organize your downloads and provide updates in a central spot for Humble Bundles (like the Amazon Marketplace), which should be ready for the public in the next couple of days.
Additionally, the apps themselves will notify you if there is an update, akin to how Sparkle works on Mac OS X (Adium, et al. use this).
Finally, you can download updates from our website similar to how it works for PC.
Additionally, the apps themselves will notify you if there is an update, akin to how Sparkle works on Mac OS X (Adium, et al. use this).
Finally, you can download updates from our website similar to how it works for PC.