We contributors to The Field Guide To Writing Flash Fiction (from Rose Metal Press) got a nice Valentine's gift. Fiction Writer's Review chose the books they loved in 2009 and Field Guide is among them (the information is under "collections"). See the list of love at http://fictionwritersreview.com/essays/a-valentine-books-we-loved-in-2009 Thank you for loving us!
Here are some stories available on the 'net that I consider outstanding examples of flash fiction. I'm betting you'll enjoy them too. (I'll post links to other outstanding flash fiction at another time.)
John Updike's "Pygmalion"
Aimee Bender's "Appleless"
published in FAIRY TALE REVIEW.
Donald Barthelme's "The Glass Mountain" (a list story)http://www.fti.uab.es/sgolden/docencia/glassmountain.htm