Has some useful info on how to use proxy bind
Good explanation of LDIFDE
http://searchwinit.techtarget.com/tip/1,289483,sid1_gci1187396,00.html
Using LDIFDE to import and export from AD
http://www.computerperformance.co.uk/Logon/Logon_LDIFDE_Export.htm
More help using LDIFDE