The Lens Blur Filter: Mimicking the shallow depth of field found in high-end optical lenses, this filter gave digital photographers the ability to create realistic "bokeh" effects in post-production.
CS 8.0 integrated this directly. It allowed photographers to adjust exposure, white balance, and lens corrections in a non-destructive environment before committing to pixel editing. This feature single-handedly changed the professional photography workflow, turning Photoshop into a complete darkroom solution. Adobe Photoshop CS 8.0