Other World Computing (http://www.macsales.com) has announced two enclosure solutions for utilizing the factory Flash SSD from any 2010 or 2011 Apple MacBook Air model as an external drive.
Both the OWC Mercury On-The-Go (S$69) and OWC Mercury Elite Pro mini enclosure ($109.99) solutions provide MacBook Air owners continued external use of the factory drive. They also offer a method of data migration when upgrading to the higher capacity and higher performance of an OWC Mercury Aura Pro Express SSD.