Today is the 29th Day of Shaaban 1433, That makes 2mao the day of Doubt (Yawma Shaaq). Its sunnah to have the intention of fasting tomorrow and break only upon hearing that the moon isn't sighted.... Ramadan Kareem Yah Ikhwaanu Muslim and Ikhwaatu Muslimat......
In Addition to this, The Prophet(SAW) told us that we must commence fast when the moon has been sighted and also we must stop fasting upon sighting of the moon.
If the moon is sighted tonight then fasting commence tomorrow but if otherwise, then we can count Shaaban to be 30 days and commence fasting on saturday(21/07/2012). Islamically, in this kind of situation we just hope that the moon is sighted today and not to conclude that today is definately last day of any islamic month.
I hope this message of mine will be beneficial to my Muslim Readers on Nairaland.