I can't seem to install the new version of Gmail. The option to uninstall Gmail is not available from Settings > Applications or from ChevyNo1 Tools. When I try to install the .apk, it just says "Application not installed".
Information about the upgrade is here: Download: New Gmail Version 2.2.1 | Droid Life: A Droid Community Blog
What can I do to resolve this?
UPDATE: Problem solved by uninstalling via Titanium, rebooting, and installing via Astro. Thanks, Meowmix!