It's the What's New button.Where is the "all unread threads/posts" option?
A while back the "delete post" option was removed from us users. It's now back - however, it will prompt you to give a reason for deletion. I guess this is, again, up to Jon to decide whether to retain this option or not.
It looks like topic subjects can't be changed, or at least; I can't find the option. That's very unhandy. E.g. take a look at the survivors, or my own top 50 topic. I want to do #15 now but I can't change the title from 16 to 15.
Same goes for post subjects.
Is editing polls possible?
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Bottom right of the post, number beginning with the # should give you a popup offering the link in BBCode, HTML and a bunch of sharing options.