The lightest full-featured laptop with 14.1" screen on the US market is Asus M2400e:
http://www.escstore.com/product.asp?...MBO&dept_id=12
As far as I know it is not that popular and only available from one place in the US (you might find it elsewhere as well). Granted the support for it might be questionable but at least Asus makes its own laptops unlike Dell.
Also the seller has good ratings.