Actively maintained

The YouTube field module provides a simple field that allows you to add a youtube video to a content type, user, or any other Drupal entity.

Display types include:

Register your custom Form API forms and embed them into Panels/Page Manager using Ctools' Context system.

Sell Organic Group membership to one or more groups when a user purchases a particular product.

Provides integration with Foursquare for Drupal 7.
For installation, currently implemented features and upcoming features:

Implementation of hook_element_hooks to provide options to define array(2D) of radios as a single form element.

Tentative sandbox repository for mobile initiative.