Oil is an effective weapon which might be politically, economically and socially influential when used as a "soft" power. It becomes further effective when used to build the mind of mankind to achieve stability and sustainable development, especially in a country like Iran, where large segments of society live in "dire" living conditions, as the case is in Al-Ahwaz, where the mullahs' policies deliberately impoverish these areas.
The falling oil prices make it harder for Ahmadinejad to overlook the sanctions imposed by the international community. This will force his country to downplay its hostile and challenging tone with which it faces the world, and lower the ceiling of its demands over its nuclear program.
I often tend to take in the belief of some people that Iran's announcement of the test run of the Bushehr nuclear power plant with non-nuclear fuel is an attempt to speed up negotiations over its nuclear program, so that it can weather the global financial crisis which has started to sicken it, scaring away its citizens.