Having a IPMI that's supported/works in ESXi is best(more reliable, among other things), however all you really need to play with DPM is a LAN controller/BIOS that supports WOL.
Read these links;
http://www.boche.net/blog/index.php/2009/03/16/dpm-best-practices-look-before-you-leap/
and
http://solori.wordpress.com/2009/07/24/in-the-lab-vsphere-dpm-quirky-but-functional/
Read these links;
http://www.boche.net/blog/index.php/2009/03/16/dpm-best-practices-look-before-you-leap/
and
http://solori.wordpress.com/2009/07/24/in-the-lab-vsphere-dpm-quirky-but-functional/