>>Among many new enhancements in the last week, one of the most interesting is the preview of images inside a message.
>>
>>For example, message #1396829 is an example of a message containing five images.
>>
>>The maximum number of attachments in a message was increased to 10.
>>
>>This message includes some images as well for the demonstration.
>>
>>Clicking on the thumbnail will show in-page image instead of opening a new window, which is much faster and can be closed with a click on the X or ESC.
>
>Very nice - thanks!

And it's very intuitive - I just guessed how it works before seeing this thread.