At this moment, Blu-ray is winning but who knows. Rumors that Warner Brothers' considering moving to Blu-ray only since most of their titles sells more on Blu-ray than HD-DVD. A lot of online sites or retailers drops HD-DVD because Blu-ray sells well. Local BestBuy had expanded Blu-ray while HD-DVD remains the same. Blu-ray has more studio suppoters than HD-DVD.
This holiday, stuff is looking good for Blu-ray. Also keep it in mind, several studios finally get in picture feature on Blu-ray so now HD-DVD isn't only one that has those features.
Blu-ray is catching up quickly and offers what HD-DVD is currently offering. I noticed HD-DVD movies price is slightly more than Blu-ray movies... hmm.