Neda Agha Soltan is Iran's undisputed hero. The most inspirational heroes are almost always the unintentional ones. For more on her story, see this excellent Time magazine (Robin Wright, June 21, 2009) link:
It is over for the current Iranian regime. The only reason more Iranians aren't revolting right this second is because not all towns have internet access, so not all Iranians can see the government-sponsored violence and killings. America had a similar moment with Kent State. This is Iran's Kent State. It took several years after Kent State before America withdrew from Vietnam, but the moment the government shot American students, it lost credibility. It might take a few more years, but the current Iranian government has lost legitimacy. May the current Iranian regime burn in hell for the violence it has inflicted on innocent, courageous protesters.
Update on June 24, 2009: CNN has a wonderful article on Neda: