Looking for information on OPEC

I'm doing a presentation on OPEC (Organization of Petroleum Exporting Countries) tommorow, and am doing research for it right now. I was wondering if anyone on here could help out if they know anything interesting concerning these particular areas ofthe topic:

1. History
2. Aim
3. Financing
4. Activity
5. Membership (if applicable)
6. Controversy and criticism
7. Presence worldwide

If anyone could help out with links to any of this information, I would really appreciate it.

Maniac456