For those who read Gmail via its Web interface, including in Mailplane, Google has released a Gmail Labs feature called Preview Pane. It gives Gmail a vertical interface with labels on the left, a vertical list of message summaries in the middle, and the main conversation display pane on the right. It works best with wide screens, though if you have a tall screen, you can switch it to a horizontal split instead of a vertical split. The approach is much more like Gmail’s tablet interface, and in turn like Mail on the iPad. follow link
Open Links from Apple Mail in the Background
If an email message in Mail includes a Web link which you'd prefer to check out after you've read all your mail, and you don't want to hunt for the link later, Command-click the link in the message to open a browser window in the background. Mail remains the foreground application, and the browser window can wait till you're ready.
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Gmail Gains Optional Preview Pane