Mac: Leaf is a news reader that syncs with Google Reader. It makes browsing and reading your feeds easy while keeping the amount of space the app takes up to a minimum.
There are plenty of desktop Google Reader clients that sync your RSS feeds, give you more features than Google's web app provides, and make keeping up with your favourite sites more fun. Leaf reminds me a bit of previously mentioned Cream: Leaf lists your stories vertically in a scrolling window that you can adjust, and when you click on a story, it opens up in a pop-out window on the right side of the screen. When you're finished, close the window and go back to scrolling.
When you first launch the app, Leaf prompts you to connect it with your Google account so it can pull in your Reader subscriptions and sync your read/unread articles. From there, new stories appear at the top, and the icon next to the headline indicates the blog the article came from.
You can easily mark all articles as read with a button at the bottom of the window, subscribe to new feeds through the app, search for a specific story using the bar at the top and view starred articles with the star button at the top. Right-clicking any article lets you star it or open it in your main browser.
Leaf supports multiple Google Reader accounts. It can notify you when new stories come in, and it even lets you manage your subscriptions from the options window. Aside from that, the app walks the line between being minimal, offering you only the essential features and making sure the features it does offer are useful.
Leaf ($4.49) [iTunes App Store]