Here's an article at High-Def Digest on the sales figures between HD DVD and Blu-ray. According to the figures, there are more Blu-ray players out there than HD DVD players, but as High-Def Digest points out, this is mainly due to the fact that Sony is force feeding Blu-ray to gamers in their PS3.

This is opposed to the HD DVD numbers where people who purchase the players or the Xbox 360 add-on, actually are doing so to view HD DVDs.