Reeder, the preeminent feed reader for the iOS has arrived on the Mac.
As the ‘draft’ status of the app suggests, it’s not yet ready for everyday use—there’s no way to manage feeds or download enclosures, and it doesn’t stay in sync with Google Reader very well. But it’s close, and the iOS version’s seamless integration with third-party services like Instapaper and Pinboard is in place.
It’s also interesting to see an iOS app transfer to the Mac, which as Patrick points out gives Reeder a distinctly Lion-like feel. Some of these iOS-ish elements translate well to the desktop, like the subtle animations triggered by switching from feed to feed. The realistic paper backgrounds, I’m not so sure about: they seem apt on the touchy-feely iPad, but look out of place on the Mac (for now?).
One quick tip: Reeder defaults, oddly, to showing an icon-only view of your feeds and folders in its leftmost pane, which makes it completely impossible to find the feeds you want to read. Widening that column a bit gives you a much more sensible text label view.