This is an extjs single-page application which works fine in FF, IE, and Safari.
There are several problems with viewing or using this extjs app in the iphone. The extjs panels/windows do not resize, as it would in a normal screen. When the user zooms out, the expanding viewing area is blanked out. An example image is below:
Rather than using viewport, I used a column layout panel container. Most of the extjs stuff works fine. I placed this container layout into a div and specified its height and width. Also,
<meta name="viewport" content="height=700" />.