Reread or archive? Of course you can bookmark any interesting post, and organize these bookmarks per subject. Or put it on your Safari reading list for reading at a later time. You could print to pdf, the length of the pdf being limited to one webpage of a post (and with quite a lot of empty space on most pages of the pdf). Or you can save to Evernote, which works fine, but is also limited to one webpage of a post at a time. In Evernote you can categorize, tag and search.