Slimbox2 Slideshow is a WordPress plugin used to display Lightbox effects on images.
Automatic Image Link Tagging:
enabled - no need to do anything, images will automatically be shown in a Lightbox when clicked. disabled (advanced) - rel='lightbox' attribute will need to be manually added to the image 'a' element after the 'href' attribute.
Add a 'title' attribute after the 'href' attribute to show a caption on the image i.e. title="this is a caption"
Slideshow of all blog images:
Simply create a link to url "#slideshow" (or even just "#slide"), i.e. href="#slide". On click a full slideshow of all your images will start. Example here.