Charles Bernstein's site here:Nathaniel Mackey: 2006 National Book Award for Poetry . . .links to him here:PENNsound: Nathaniel Mackey,where there are audio's of him reading his poetry and giving talks.
Ron Silliman's entry here--Nate Mackey has won . . .--has a few pretty good links on him too. Specifically here--Splay Anthem , by Nathaniel Mackey--at ND Publishing, there is an excerpt of a poem, and a link to a longer one (8 pages) at the bottom.