There's a new Chrome tag page (like the one there now that shows bookmarks) that you can "install" webapps onto your browser. Essentially, it's a shortcut center to the webapps you use. Then, there's the web store.
Clicking the web store icon will give you a web store where you can buy and install webapps. Then it gets added to your tag page for easy access. One example: Plants vs. Zombies.