I told you about Google Reader saying goodbye soon and I was really shocked. Can't someone just buy that from Google? Anyways, the first alternatives I saw were RSSowl and NetNewsWire but they're not so promising. They're nothing like Google Reader.
On the other hand, I've been using Feedly, a Google Reader client on web browsers and mobile devices, for the longest time now. Apparently, Feedly will have a Google Reader-like service of their own and will offer users a seamless transition from Google Reader to their service, currently codenamed "Normandy": http://icohgnito.tumblr.com/post/45336617243/google-reader-and-feedly
Of course, Flipboard is another option but I'm not really a fan of it.