One-Click Upsell allows you to specify an upsell package (a group of products and subscriptions) to offer to your customers by providing a button that will apply the upsell when clicked.
Scarcity Triggers allows for you to count how many people in your application have a specific tag. Taking into account the number of contacts who have that tag, you can apply a specified tag based on the criteria you determine.
Simple Email Survey allows you to embed a one question survey into your Infusionsoft emails. Based off your contact's answer, you can apply a specified tag, and redirect them to a specified web page.
This feature can be used to dynamically send your contacts to different landing/thank you pages based on criteria you define. It also combines the functionality of Action Links and allows you to apply tags or trigger API goals based on that same criteria.
SMS Sequences allows for you to configure a conversation style SMS sequence to take place upon receiving a keyword, or via HTTP Post, from a contact or potential contact to your phone number. This feature also provides some simple reporting, showing how many contacts submitted each answer.