Lets take a look at HP/Compaq for a second.
HP Business Line: High quality, high priced, not cutting edge laptops
HP Pavilion: A higher end, higher quality Presario
Compaq Presario: cheap, ok quality
so if HP-Compaq was Hyundai, this is how it would break down:
HP Business : 2005 Hyundai Sonata
HP Pavilion : Other Hyundais
Compaq: KIA (yes, kia is owned by hyundai)
Even now dell somewhat has a split in it's line up if you look.
In the Desktop world we have the business workstations which are higher quality and higher price than the home model Dimention, and as always there is the XPS which is the "premium" model. In Laptops we have the mainstream cheap Inspiron line, then we have the business class Latitude line, and finally the XPS Gen 2. The line is thin, but its there, guess they are making it a bit thicker.