Selectively turn off all but 'New' posts?
It would be handy to have a switch that would suppress all but the subject, date, and poster for posts that have already been read. You already keep track of this with the 'New' marker, but suppressing the body of the previously seen post would make it easier to find the new ones. The switch is important to be able to read the post in context, if needed.
Also, on the subject of 'New', it appears that if I look for posts on the second page of a thread, all the posts are marked as not-new, so the functionality is lost except for the first page.
I hope these suggestions aren't too difficult to implement, and perhaps you already are working on them.