Attaching Images
Previously, you had to upload your picture to some website and then embed a link to it. You can still do that, but if you want a quick and easy way to attach an image, there's an "Upload to TinyPic" button on the page where you type a new post.
Let's try it right now...

If your image is large, it helps to resize it to "Message Board" size - the TinyPic uploader can do this for you automatically.
Embedding YouTube and Vimeo videos
You can also now embed YouTube and Vimeo videos directly into your posts. At the top of the post editor are buttons for text formatting (those have always been there) - now there are two new buttons for Vimeo and YouTube.
If you have the URL to a YouTube video, say like this:
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http://www.youtube.com/watch?v=KVRywwzOSVY
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[youtube]KVRywwzOSVY[/youtube]
Vimeo works in a very similar way. Let's say you have this Vimeo URL:
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http://vimeo.com/36436964
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[vimeo]36436964[/vimeo]