This is the part where he mentions the "mark as unread" as a premium feature, not a bug.
Also, in that interface, there's a new option that I want to try out before including it in the text version of message navigation: "Mark as Last Unread".
This one should prove to be terribly handy. If you click it and you're, say, 30 posts away from the last post on the board, it'll set that as the last unread board on that board and take you to your Favorites screen (since you'll typically only click that when you're done reading the board for a while) and it'll show 30 unread message for that board. Clicking the number of unread messages will take you to the one right after the one you set as your last unread.
I think this'll neatly solve a problem of inconvenience we've had with dealing with unread posts.
Let me know what you think, both from an aesthetics perspective, and functionality.
But, again, I already know about the extra blank "menu" being shown right below the messages and will work on that.
If the Mark as Last Unread thing is working well, I'll include it in the text version of the interface and make it a Premium feature.