I came across a couple of useful posts from Scott Guthrie about App_Offline.htm. This page appears and disappears automatically when the “Publish Web Site” option is used. What I didn’t know is that it’s part of the .NET framework (not the IDE). This means the page can be added and removed manually. This will be especially useful in my current environment, where we depend on network engineers to deploy web applications to test and production sites.

Here are the posts:
App_Offline.htm and IE Friendly Errors

Announcing App_Offline.htm