New and Upcoming Channels in 2H 2007 and Early 2008
August
Animal Planet
Discovery
TLC
The Science Channel
September
Cinemax (MoreMAX)
HBO (HBO2, HBO Family, and HBO Signature to start, with all remaining HBO channels to follow over next six months)
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 just added the first group a few days ago, 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.
DirecTV is using MPEG-4 compression to deliver these channels, so none of them will work with the DirecTivo DVRs. With DirecTV HR20 DVR with their own software is their only DVR with support for these channels. If you want Tivo capability with these channels, you'll have to switch to cable and get the TivoHD.
You'll have to wait a long time to get 100 -- let alone 150 -- HD cable channels with DirecTV. The claims you see on TV are with regard to total future capacity, and even those statements are a bit misleading, since DirecTV figures upcoming HD-PPV in that number. DirecTV also counts sports packages by the number of channels they require (i.e. Sunday Ticket isn't one channel, it is 6+ and the same will go for MLB Extra Innings when it is added in HD).