This spec provides a listing of functionality in Xara but not in Inkscape. It also identifies which of the functionality would be worth implementing in Inkscape, with some prioritization suggestions.
Listing Xara-specific functionality is a first step towards actually gaining this functionality in Inkscape. By doing so, it will both ease transition of Xara users to Inkscape, and make Inkscape a better application.
List of Xara functionality not in Inkscape
See Xara X, please edit that page instead of duplicating stuff here!