The Iowa Review publishes poetry, fiction and nonfiction three times a year; April, August and December and they accept unsolicited work in September, October and November with no reading fee.  Their contest is one I consider every year because to win is considered prestige.  There is a Minnesota connection for the 2011 contest. Patricia Hampl will judge non-fiction.  No email submissions are accepted and there is a $20 entry fee. An additional $10 will get you a year-long subscription to the magazine.  LA Carlson