Upcoming Jewish Holdiays:
40 Days of Teshuvah begins sundown August 11, 2010 and ends with Yom Kippur.
Rosh ha-Shanah Tishri 1 or Sundown September 9, 2010
Days of Awe - the 10 days leading up to Yom Kippur
Yom Kippur (Day of Atonement) September 18, 2010
Look for blog posts discussing each of these!