Take two high-definition DVD players into the shower? Not me - and here's the science bit. Samsung are gearing up to release their "Duo HD" player, the BD-UP5000, in the USA come December; it's capable of playing both HD-DVD and Blu-Ray titles in delicious full 1080p quality.
At the same time, Warner Brothers are rumoured to be released the first dual-format DVDs, which have both HD-DVD and Blu-Ray content on the same disc. Presumably you lose out on special features and extras, rather than have the quality of the title movie impaired.