Came across this and thought it was cool. WB is offering to send you a Blu-Ray version of regular DVD titles (for a fee of course and for S&H) that you have sitting on your shelf.
http://www.dvd2blu.com/
US only unfortunatley, hopefully we can get something like this up here one day. Pretty cool. Not many titles to choose from yet, but i'm sure that will increase over time.