Add a link to the apps I/O presentation from the docs.

chrome/common/extensions/docs/apps/about_apps.html

Index: chrome/common/extensions/docs/apps/about_apps.html
diff --git a/chrome/common/extensions/docs/apps/about_apps.html b/chrome/common/extensions/docs/apps/about_apps.html
index dd85db485dd5af46e3b3df390ccaaacbc7746641..6156f7463e71d44d3e03d0f268c2e3c169b2429b 100644
--- a/chrome/common/extensions/docs/apps/about_apps.html
+++ b/chrome/common/extensions/docs/apps/about_apps.html
@@ -194,15 +194,16 @@ and they have native-like capabilities
 that are much more powerful than those available to web apps.
 </p>
 <p>
-<iframe title="YouTube video player" width="610" height="380" src="http://www.youtube.com/embed/lBUGTVIJVfM" frameborder="0" allowfullscreen=""></iframe>
+<iframe title="YouTube video player" width="610" height="380" src="http://www.youtube.com/embed/lBUGTVIJVfM" frameborder="0" allowfullscreen=""></iframe><br>
+(for a more in-depth overview video, see the
+<a href="http://www.youtube.com/watch?v=j8oFAr1YR-0">Chrome Apps Google I/O 2012
+presentation</a>)
 </p>
 <p>
-With access to Chrome APIs and services
-not available to traditional web apps,
-you can build powerful apps that interact
-with network and hardware devices,
-as well as, media apps.
-Here's a short list of examples:
+Packaged apps have have access to Chrome APIs and services not available to
+traditional web sites. You can build powerful apps that interact with network
+and hardware devices, media tools, and much more. Here's a short list of
+examples:
 </p>
 <ul>
 	<li>Shells (VMWare, Citrix, SSH, RDP or VNC clients)</li>