Running out of IPv4 addresses:
This is a very interesting presentation given by John Curran, President and CEO of ARIN.
John goes into detail about the problems ARIN have faced trying to prepare ISPs for IPv6, backwards compatibility issues and predicts that in a years time, ARIN will run out of IPv4 addresses.
In a years time you should definitely turn your hand to IPv6 consulting
The presentation can be found in PDF form here: http://www.defcon.org/images/defcon-18/dc-18-presentations/Curran/DEFCON-18-Curran-IPv6.pdf