iTunes & HD - when?

[whiteshadoww]

Are TV shows and movies already available in HD? I looked but could not find a search engine that isolates HD programming.

Perhaps they have not started making TV shows and HD movies avialable. If not, any idea when? Thanks.

[rowlands]

I know this is late, but I just bought season 2 of chuck and pleasantly surprised to find it in HD, and the file size seems to be the same as the SD format of season 1.