Dell will only ship and support under 64 bit Vista. It's the same for their Studio XPS systems.
Disaster. To advanced for the software vendors.
Adobe don't support Photoshop or Premier elements under 64 bit Vista, Sony don't support Vegas Movie Studio. In fact, most suppliers don't support their domestic versions of software under Vista 64 bit.
There are very few native 64 bit applications - Office 2007, Open Office etc. are all 32 bit. Even anti-virus software is 32 bit native. This is "may" be OK, but you get worse performance.
Dell want to compete with Apple, a 9 inch version would be something Apple dont' have. Alas, they don't control the software like Apple do. Initially customers will be happy with their new toys, then they will try and get software to use on them and it'll be all tears...