Recently we had Mary Poppendieck give a talk at Agile Auckland
Mary is a great presenter and she really knows her stuff! I orginally met her at OOPSLA in 2004 where she was giving talks and promoting her book Lean Software Development.
Anyone interseted in Agile ideas should have a look at her stuff. Especially if you don't buy into "All" of agile and are more interested in customising "agile ideas" to your own enviroment.
Anyways, the slides for her presentation she gave can be found at http://www.agileauckland.com/Beyond_Agile_Auckland_2007.pdf