I'm not a fan of Egyptian blogger
sandmonkeyat all, but he was invited to Cairo University to attend the speech and his report is very good.
What I think in a nutshell:
Obama needs partners and supporters in the US to help him deliver on his paradigm-changing words.
In the Arab/Muslim world, with the exception of Iran and a few Islamist movements, most of the regimes are pro-US and will happily support him. It will be Israel's government that will most likely hold things up.
Obama's speech has won him extra affection at the street level; it will probably stem the drip-drip leak of angry men to jihadi-type activities. But decisions and actions by the Obama administration, to back up the words, are crucial.
More links and comments to follow ...
Obama would win presidency of Egypt easily.
British-educated, Harlem-based Egyptian Mona El-tahawy always has a different take.