Both the Motion Computing LE1700 and Motion Computing J3400 have a keyboard option, so you can use them like a notebook if you want, or like a slate tablet if you want. They also have docking station options so you can use your normal keyboard, mouse and monitor when you back in the office etc.
The advantage of the Motion Computing products over the Dell Latitude is the LED Backlit screen is heaps brighter so you can use outside; the internal HSDPA modems are certified for use on Telstra Next G (7.2mbps), they have an integrated 2.0 megapixel camera, and are more rugged so won't break if you drop it.
Although Motion Tablets are not Touchscreen (or Multitouch), there are no business applications available to take advantage of this anyway (i.e. you can't do business with ITunes!), so using the digitizer is much more reliable and you won't suffer any blue screens of death!
For more information on Motion Computing go to the Workflow Computing website, Australia's only dedicated Motion Computing online store: www.workflowcomputing.com.au