There are a lot of titles listed for release but only these few that have street dates. PM if you find other HD-DVD titles (no Blu-Ray) with actual street dates and I'll add them to the list.
4/18/06 - The Phantom of the Opera
4/18/06 - Million Dollar Baby
4/18/06 - Last Samurai
4/18/06 - Serenity
4/25/06 - Doom Unrated
4/25/06 - Apollo 13
On a side note, I just returned from Target.com, ordered up The Phantom of the Opera and Serenity.