For the medicine nerd in all of you, I thought I would pass this along...
I recently spent a lot of time looking on the internet for a freeware DICOM (medical image filetype based on BMP or TIFF) viewer for looking at computerized CT scans at home "offline" - mostly for a research project I am doing. ANYWAY, there is a ton of trialware outthere. Some of it is good, most of it is not. Most are very large software packages and very difficult to use/install/uninstall.
ImageJ is Java-based DICOM viewer that has all the features most of us non-superuser-non-radiologists could need in a lean & mean package. It is open source and there is a large collection of plugins that integrate easily (some quite elaborate). ImageJ's web-home is hosted by the NIH, but not really government sponsored or supported. There are some forums and ImageJ superusers out there that you can contact.