Oooh I'm so excited to discover this. I did a search on this board and didn't see it mentioned, so I'm sorry if I'm not the first to post about it.
So you know how sometimes there's a very long thread? And deep down the thread someone posts something you want to bookmark? But if you bookmark the whole thread, it'll be a pain to scroll through it looking for that one post you want. Well I discovered you can bookmark just one post in a thread!
At the top of each post, before the "about x hours ago user X replied", there's a symbol like a single section of a chain link (or like a mini UFO). Click on that symbol to link to that post only. Then add the bookmark to your IE or Firefox or other browser bookmarks. When you open your bookmark next time, you'll see that post at the top of your screen. And obviously this is also how you point someone to a particular post (not just the thread). Yay! I love you, new Board!!