With Google Apps, instead of spending time behind-the-scenes patching existing systems, you can focus on providing new functionality that'll have a material impact on your business. Google Apps Marketplace offers more than 100 cloud apps that integrate with Google Apps, many of which're free to get started, so they're easy to try and can deliver immediate value to your users. Marketplace apps come in many sizes, from bite-size apps that add features to Google's existing applications to large apps that can run major business systems and processes. As an Apps administrator, once you install and evaluate an app, you can deploy it to your users in only a few clicks.
Here's a quick list of recently added to Marketplace: Kwaga, Mailchimp, MyERP.com, Promevo, and Viewpath.