http://www.dvd2blu.com/
Exchange your Warner Bros DVD's for Bluray discs for a small price.
I'm sending several of mine in tomorrow. Will tell you how it goes.
UPDATE
I got my dvds back quicker than expected and they came in nice bluray cases.
Also i found that disney has an exchange program as well and im going to send a few into them.
Not alot of DVD's to choose from like the warner bros one but enough that im gonna try it.
http://www.disneyupgrade2blu.com/