I hope this is the place to give comments on the beta 2.7.
First of all, I love the backend. It's a real improvement.
But I encountered a problem with the media uploader and nextgen gallery.
If you upload a picture with the uploader from the tab Gallery and you choose position none - only the code is shown [singlepic=5,etc,,none]
When you delete 'none' or choose in the uploader for a position, like left, right, the picture is shown in the text. It is not a big problem, but I just encountered it.
Good luke with improving 2.7. Can't wait to use it on my other blogs