From the project page:

Open source video solution.

Used on http://drupal.org, "This module stores the changes of a node into a field attached to comments allowing to display a kind-of activity stream on the node much like on drupal.org issues just with a lot less custom code."

There is a great article that shows how all of the Acquia sites are architected. In that article, it is mentioned that Services is used quite a bit to power REST endpoints. Here is a really, really, useful tidbit that I don't want to forget which comes from that article.

Lets you use tokens to embed video and have the ability to add a button to the WYSIWYG for easily adding a video (for those to0 lazy to type).

An example module which integrates the Flag module with a custom form.

Gives replacement tokens. This module is used by so many other modules, you are sure to use it and learn it if you haven't already.

"Define dependencies between fields based on their states and values. "

Use PHP to create computed fields. If you use this, export the configuration so you don't have PHP in the db!

"auto_nodetitle" is a small and efficient module that allows hiding of the content title field in the form. To prevent empty content title fields one can configure it to generate the title by a given pattern.

When the token module is installed it's possible to use various node data for the
auto generated title - e.g. use the text of a CCK field (since 5.x).

Advanced