Below is the link to an audio [mp3 format] recording of a shiur that I gave last night at the Tikun Leil Shavuot at MMY (a seminary in Yerushalyaim), Topic was "What's special about the Number 7 - from Hoshana Rabba to Parshat Breishit] You can download it here: http://www.mevaseret.org/mmy/searchshiurim.php?shiur=314 Moadim l'Simcha