When praying the weekday 'Amidah, if one wishes to make any additions to any of the thirteen middle blessings...
Wednesday, June 29, 2011/Siwan 27, 5771

If, during the summer months, one says Barekh 'Alenu (or Ten Tal Umattar in the Ashkenazi custom), instead of...
Monday, October 4, 2010/Tashri 26, 5771

Even though we say Mashib HaRuwah Umorid HaGeshem on Shemini 'Asereth, we do not say Barekh 'Alenu (WeThen Tal...
Sunday, October 3, 2010/Tashri 25, 5771