Are you a fancy suit, known to occasionally dabble in the fine art of scribbling? Have a seat bud, because Dell's gone and put up a pre-order page for the touchscreen convertible that you've been waiting for: the Latitude XT3. When we last espied the drop-top in February, we came away mighty impressed with its spiffy 13.3-inch dual-digitizer display, which recognized the attached stylus in addition to three of our meaty digits. We also liked the inclusion of the Core i3 -- upgradeable to