Huzzah! Gmail on Honeycomb is deemed as one of the best versions of Gmail, and now the desktop version has access to a coveted Honeycomb feature: preview panes. By going into Settings, then Labs, you can enable the Preview Pane, which lets you see emails without loading a new page for them and even allows you to split the content vertically or horizontally, which works well on large, high-resolution screens. It’s handy and I’ve already enabled it for my personal account — go ahead and check it out.
Via: Official Gmail Blog