Gmail's latest Labs offering is a tiny little thing, but perhaps a great one, especially on larger screens. Enable "Move Icon Column", and your attachment, calendar and other message icons move to the left of your subjects from the right.
For those with widescreen monitors, having the icons lined up where you're already looking should save a few neck turns. For everyone else, it might just make sense to keep your Starred icons and other notifications lined up together. Hit the Labs section of your settings to enable it or just click the green test beaker icon in Gmail.
New in Labs: Move the attachment and other icon column [Official Gmail Blog]