Harris Diamond, CEO of the giant Interpublic (NYSE: IPG) agency Weber-Shandwick jumps to the number one spot on PRWeek's 2009 Power List, topping Richard Edelman, the top dog for the last two years.

The trade magazine cites the number of fingers Diamond has in IPG's Constituency Management Group (CMG) division as the reason for the jump, as well as his dominion over other IPG divisions that help Weber intergrate including sports marketing agency Octagon and events firm Jack Morton. PRWeek also credits Diamond's thumping on leadership and reputation as the two main qualities helping WS deal with the bad economy.

Edelman sticks around at #2, and the recently-retired Charlotte Otto from Proctor & Gamble maintains third. Leslie Dach from Walmart moves up from 6th to 4th, and Jon Iwata rounds out the top five (down from #2 from 2008).

Power players six through 25 are after the jump, with the full list of 25 here:

6. Robert Gibbs, White House Press Secretary, President Barack Obama
7. Sally Susman, SVP and chief communications officer, Pfizer
8. Ray Day, VP, communications, Ford Motor Company
9. Ken Cohen, VP, public affairs, ExxonMobil
10. Mark Penn, CEO, Burson-Marsteller
11. Bill Margaritis, SVP, global comms and IR, FedEx
12. Dave Senay, CEO, Fleishman-Hillard
13. Gary Sheffer, executive director, comms and public affairs, GE
14. Rachel Whetstone, VP, public policy and comms, Google
15. Jack Daly, SVP of corporate relations, McDonald's
16. Ray Kotcher, CEO, Ketchum
17. Ray Jordan, VP public affairs & corporate comms, Johnson & Johnson
18. Simon Sproule, VP, corporate comms, Microsoft
19. Julie Hamp, SVP of corporate communications, PepsiCo
20. Joele Frank, managing partner, Joele Frank, Wilkinson Brimmer Katcher
21. Maril MacDonald, CEO, Gagen MacDonald
22. Steve Lipin, senior partner, Brunswick Group
23. Joseph Evangelisti, managing director, corp comms, JPMorgan Chase
24. Margery Kraus, CEO, APCO Worldwide
25. Melissa Waggener Zorkin, CEO, president, founder, Waggener Edstrom Worldwide

[photo via WeberShandwick.com]