John,
Have a look at this one, they accept flash. The site looks pretty snazzy.
http://www.ideomancer.com/main/ideoMain.htm
Saz
<Added>Ideomancer publishes science fiction, fantasy, horror, slipstream, and flash fiction. We are open to any story with a speculative element-the supernatural, the unexplained, or the undiscovered. Stories without this element will not be considered. In other words, no matter how brilliant your serial-killer story is, it won't pass muster with us; we want that something extra that pushes a story beyond the bounds of reality. We also accept poetry — we're open to anything other than epic with a speculative element.We will only consider one poem at a time. Please do not send more than one poem per submission and do not submit additional poetry until you have received our response. Emails containing multiple poems will be deleted unread. You may submit stories to Ideomancer while your poetry is under review, but do so as a separate submission in a separate email.
Our reading periods will be the months of December-January, March-April, June-July, September-October. Any stories or poems submitted to us during the months of November, February, May, and August will be deleted unread.