With Kippt we want to make the saving easy and fast, so the default is that when you save a page 1) we store the page content to full text search (available for pro users) 2) we get the main image, and try to decide which type of link it is (github repo, website, article, video, image, presentation etc..) and present the clip in the right way in the interface.
We have had also plans for full-page archiving, files and we could support selective saving (save only this paragraph/image).
For now, for example you want to save ab image, just open it to a new tab and save that. With text, just highlight the paragraph and hit the extension and the text will be saved as a note. (You can also make plain markdown notes[1] but we don't have interface in the extension for it yet).
[1]: http://cl.ly/image/382k0p3Y3e1P