With the launch of Subscriptions, you can now request that specific content be sent to you automatically.  Just look for orange subscription buttons:

1.    Within the Vuze HD Network
2.    In your Library

Advanced Users:  You can also create a Subscription using search, or an RSS feed on a 3rd-party site.  Click the + button next to Subscriptions in your Sidebar, and select the "Create New Subscription" button at the bottom.