Discovery launches Animal Planet HD, Discovery HD (different from Discovery Theater HD), TLC HD, and The Science Channel HD later this week.
August
Animal Planet
Discovery
TLC
The Science Channel
September
Cinemax (MoreMAX)
HBO (HBO2, HBO Family, HBO Signature)
History
Starz (Starz Comedy, Starz Edge, and Starz Kids)
TBS
The Weather Channel
October
CNN
October/November
Cartoon Network
CNBC
FX
SciFi
USA Network
December
Tennis Channel
1Q '07
ABC Family
Disney Channel
Toon Disney
ESPNews
Dish Network will add the first group this month, and DirecTV will begin adding channels in the second half of September, but they won't be the only ones. You can also expect to see most of these channels on Comcast, FiOS, and other cable providers this year.