Very good post tranthidung but you forgot to mention the link of the user IP logs https://bitcointalk.org/myips.php
the page showing if you are proxy banned and how much you have to pay to access the forum https://bitcointalk.org/index.php?action=credit;unproxyban
and the (very) secret page showing who is currently online https://bitcointalk.org/SSI.php?ssi_function=whosOnline

I would also add the direct link of the Drafts page https://bitcointalk.org/index.php?action=drafts
the location of the number of merits sent during the last 30 days https://bitcointalk.org/index.php?action=merit;stats=topsend (at the top of the page)
and the number of merits sent in all time https://bitcointalk.org/index.php?action=merit;stats=topsendat (top of the page too)

And that small tip : when you are on the page to merit someone, like https://bitcointalk.org/index.php?action=merit;msg=54295426 for example, if you click on "Merit" from Bitcoin Forum > Merit you will reach https://bitcointalk.org/index.php?action=merit while it doesn't seem to be a hyperlink.