1. Some estimates are as early as April 07 (rumored to be Israeli intelligence estimate). Some (irresponsible) estimates run to "five or ten years". Question - can we afford to be wrong?
2. Estimated to be 50 sites - we would need to take out at least 50% of them to insure we set their program back 10 years.
3. In and around Tehran and Natanz, Arak and Isfahan
4. Estimated to take around 1,000 sorties - it would require sustained missions over ten days or more.
You seem to assume that Ahmadinejad is rational. I don't give anyone counting on the 12th Imam to sort things out after a nuclear holocaust any credit - other than being very dangerous.
Finally, I am aware that much of the younger population loves America and aspires to democratic values. However, they live in a police state - their room for maneuver is slim, and time grows short.
If you want to find out whats happening day to day in Iran, I suggest the website "Regime Change Iran".
I'll grant you that I would buy in to the Israeli intel and think targeted airstrikes could be pulled off.
The only thing that concerns me is that we seem to have this innate ability to assume all the wrong things about a country which we are fighting.