Yahoo is the latest in a line of would-be champions to try to topple king Gmail from its perch atop the email mountain. The company's newest Mail Beta (no relation to Gmail Beta) was introduced last October, but now its overhauled UI and fresh features are available to all. With the change comes quicker load times, stronger spam filtration, and it lets you send and receive Facebook updates and tweets. It also automatically turns picture and video links into thumbnail previews and handles up to 100MB attachments.
