re: suggestions
At a minimum, the U.N. should have slapped sanctions on Iran a long time ago instead of threatening them with strongly worded letters for month after month.
The mullahs of Iran are in a more vulnerable position from Iran's general population than Saddam was, but probably not vulnerable enough. One website tracking Iranian protests and things like this can be found here.
Targeted air attacks on nuclear facilities are the most obvious and practical military solution, assuming a military solution is the only option. I don't think anyone is talking about a ground invasion, although selecting and confirming targets is going to take some inside help.