Minor update to Twimager was released today. This update fixes issues with Twimager showing as a viewer for other types of images that were not supported. It also adds support for some other types of images, like ones on the device that you open with an application like Astro, for example. Also support for MMS images was added. Now you can click on the image in your MMS message and open the image right in twimager.
As always, Twimager is available for $0.99 on the Android Market, or you can get the limited version for free.