Ugh. That was really difficult. I loved Cul's story (ugh!), and TDZ's (shudder), StilLearning's made me cry and mosaix's made me snarl. AJB's was brilliant, crystal haven's was wry and funny, Clockworkbot's was thoroughly disgusting, Glen's made me laugh, Stephen Thomson's was perfectly chilling, Victoria's beautiful, Wruter's desolate -- it made me see pictures -- AmberEyes' was astounding (worldbuilding and story all in 75 words). Reiver's was superb, as ever, and Shyrka's very neat (I was tempted...) -- and those are just the ones that spring to mind immediately.
In the end, after much (mental) wrestling, I voted for Phyrebrat's eerie and beautiful story of the sands.