replaces windows default image viewer.
the windows image viewer is RETARDED by comparison in much the same way an ipod is to a real portable media player supporting FLAC and CIFS
I'm not thrilled that it solicits permission to install spyware, but at least it's presented as an option and not foisted upon the user.
Cons: unattractive gui
prompts to install toolbar, sure the author needs to eat, but spyware?