Last night Twitter revealed a major overhaul of its website.  The changes will make it easier for to navigate and provide users with a much richer experience.  In particular tweet fans will not now have to navigate away from their page to view video and images.

 From the Twitter blog:

On the site, you’ll see the familiar timeline, yet underneath each Tweet is a handful of information, deeper context and even embedded media. Simply click on an individual Tweet and a details pane slides out on the right and reveals this content.

New design. The site has a cleaner timeline and a rich details pane that instantly adds more impact to individual Tweets while still maintaining the simplicity of the timeline. And, experience infinite scroll — you no longer have to click “more” to view additional Tweets.

Media. Now, it’s easy to see embedded photos and videos directly on Twitter, thanks to partnerships with DailyBooth, DeviantART, Etsy, Flickr, Justin.TV, Kickstarter, Kiva, Photozou, Plixi, Twitgoo, TwitPic, TwitVid, USTREAM, Vimeo, yfrog, and YouTube.

Related content. When you click a Tweet, the details pane shows additional information related to the author or subject. Depending on the Tweet’s content, you may see: replies, other Tweets by that user, a map of where a geotagged Tweet was sent from, and more.

Mini profiles. Click a username to see a mini profile without navigating from the page, which provides quick access to account information, including bio and recent Tweets.

These changes will roll out as a preview over the next several weeks starting with a very small percentage of registered accounts tonight. During the preview, you’ll be able to switch back and forth so you have time to grow accustomed to the way things work.

Here’s a lovely Twitter video that displays some of the new services…