I don't know if someone has brought this up, but the
SOS dan site reflects changes related to Vol. 7.
Spoiler for Volume 7:
-The near bottom links (in japanese, with a 2 and a 3 at the begining) show the "plans" for White Day, and the "Mikuru's belated Valentine's Chocolate Draw" announcement.
-In the member section, Mikuru now appears as Vice-Vice-Chief.
-Kyon's and Itsuki's have links to images of the girls chocolates, but they are "gone".
-There is a hidden message in Kyon's section by Haruhi (highlight all to read), but I can't translate it properly. So do Taniguchi and Tsuruya.
-Another hidden link in Yuki's section, seems to have a message (I think is Mikuru's (Big) final note, but can't be sure)
-Arakawa, Mori and the Tamaru brothers section has "thank you" messages
I'm not sure if I'm missing something...