The EU is the world's
largest aid donor, if you include donations by individual member states.
Consider the US was closely associated with Mubarak, it's likely to taint any Egyptian faction it gets involved with.
The EU is more neutral, and without military ambitions. If Egyptians ask for help, the EU is a much safer candidate to provide it.
The only thing the US has going for it compared to the EU is its military, but Egypt has no need for military involvement.
It will be interesting to see how Iraq and Egypt develop next.
One government overthrown by an expensive military operation, followed by an extended occupation.
The other by an invasion of information - Al Jazeera's newscoverage from an Arab perspective, online social networking, wikileaks, etc. They all add up to expose governments in developing nations to more public scrutiny.