"apps" are the new "extensions" which were the new "plugins" which replaced "skins" which supplanted "themes". Or something like that.

How long before have to have this conversation:

"Our product needs to support user customization. We need apps!" "We have an extension framework." "But that's not apps!"

From http://www.utorrent.com/labs/griffin

The Griffin project introduces a web-based extensions framework for µTorrent to allow for easy extensibility by 3rd party developers through a simple API ... What we came up with is a web-based extensions framework where "Apps" which consist only of HTML and Javascript can be added to the client and displayed using an embedded browser window.