The CIA chief, Leon Panetta, told the US congress that there is a strong likelihood Mubarak will go shortly.
Here is what the Guardian has to say about what led to the resignation. Apparently Gen. Hassan al-Roueini, military commander for the Cairo area, told thousands of protesters in central Tahrir Square, "All your demands will be met today" report the Huffington Post
the victory is that of the Egyptian people...it is sobering