Yes - it makes it a bit easier to look at the exact bikes in question. Some newcomers just say "GT Avalanche" or "Specialzed Hardrock" which of course doesn't take into account the different models in the range.
Interesting what Giant has done for 2008, the Rainier has disappeared from the lineup with the XTC taking its place. Its really not the old XTC. Replacing the old race grade XTC is a bike called the Alliance XTC which at $1400 if its light enough might be a pretty decent race bike. Giant has put its race bike efforts into the Anthem and it looks like Specialized with the Stumpjumper and Trek with the 9.8 and 9.9 will be the main players in the HT race game.