Microsoft could be readying a test release of its IE9 Web browser, posits Microsoft-watcher Mary Jo Foley.

FORBES: In Browser Wars, Microsoft Readies The Reinforcements

As you can see in the chart above, IE9 blew away the competition when it came to blocking links containing such malware, successfully blocking those links over 99% of the time.

FORBES: Internet Explorer 9 Takes the Browser Security Crown

Browsium, on the other hand, is a client-side solution that allows IT departments to configure IE8 or IE9 to work normally for most applications, but it can apply custom settings for internal webapps that were designed for IE6 or IE7.

FORBES: Browsium Allows Your IT Dept To Finally Upgrade From IE6

Was it IE9 for mobile?

FORBES: Links 6 Jan: Why Can't Windows Phone Get Google Maps? Because IE Isn't Good Enough

So, with all popular vids encoded and every incoming one getting the transcoding treatment, all you really need now is a compatible browser -- Chrome (naturally), Firefox 4, Opera, or IE9 with a plug-in -- and to enroll in YouTube's HTML5 trial linked below to get rolling with WebM playback.

ENGADGET: YouTube starts transcoding all new uploads to WebM, already has a third of its library ready