Hello,
In the new default skin, the Alt-B key combination seems to bound to the "what links here" function. Alt-B is normally the shortcut to the bookmarks, at least in my browser (Mozilla Firefox). I find the binding to "what links here" rather annoying, because it blocks me from a keyboard shortcut. I doubt that I'm the only one annoyed by this.
I suggest that the Alt-B key mapping be dropped or changed to something else.