Early HD2 devices with prerelease ROMs had a nice feature that allowed pinch to zoom action to work everywhere on the device. Unfortunately, this has been stripped down to just a few applications on the release version.

Zoomer is a small application that has the ability of enabling or disabling the pinch to zoom action in all you aplications. After download and install, you have the option of scanning your Programs, Windows folder, Storage Card or entire device for aplications. Simply checking a box will enable pinch to zoom on that certain application once device is soft reset.

(Source: Mobility News)