Warner Brothers are currently offering an "upgrade" for HD DVD owners who want to make the switch to bluray.
The concept is pretty simple.
Most of the WB HD DVD catalogue is available on BluRay, so you simply choose the HD DVD titles you want to upgrade, add them to your shopping cart and then send in the original HD DVD covers to make the exchange.
The cost per disc is only $4.95 (+shipping), which is pretty good.
Downside - you have to be in the US to avail of the offer.