I am a big fan of Rob Bell’s of Mars Hill in Grand Rapids, Michigan.  He has done two sermon series in the last year that I think Cob’s would really find helpful… here is the link to his site http://www.marshill.org/teaching/series.php and the series are God is Green and Calling all Peacemakers.  

 I automatically download his sermons each week to my ipod and listen to them when I walk.  A great way to kill two birds with one stone… get feed spiritually and get exercize… something most pastors need.

 Also, while you are on their site, check out their xyz plan!