Stache is new Mac app that allows you to bookmark and archive entire webpages, á la Pinboard. Rather than displaying as a simple list of links, Stache takes a more visual approach by attaching a screenshot to each bookmark.
It syncs over iCloud with its iOS companion app, which has no archiving abilites but does share the Mac app's "visual bookmark" design, bookmarklet/URL scheme support, and full-content search. Although I have no need to switch away from Pinboard, Stache certainly makes for an interesting alternative.
Stache is available on the Mac App Store for an introductory price of $7 (normally $10) and as a Universal app on the iOS App Store for $2.