iPhotoDraw is free tool to add description text, callout boxes (ballons), dimensions, detailed images, and other annotation objects to the pictures.
Main features:
Supports description text, callout boxes, dimensions, detailed images.
annotation is stored in a separated file and the original picture file is intact.
100% free.
below 10 megabytes.
Supported oS : Windows XP (sp3), Windows Vista, Windows 7
Requirement : .Net Framework 3.0 or later
Download iPhotoDraw