There are many good ones, but here are my top 5:
The Malcontent By Stephen Eley (No, I'm not trying to suck up. I really liked it.)
Tk’tk’tk By David D. Levine.
Life in Stone By Tim Pratt.
Barnaby in Exile By Mike Resnick.
Nano Comes to Clifford Falls By Nancy Kress.
The Shoulders of Giants By Robert J. Sawyer.
Union Dues - Cleanup in Aisle Five By Jeffrey R. DeRego.
OK so that's 7. Forgive me, I have 14 fingers.
Regarding Tk’tk’tk, I don't think I would have liked it in written form, but read aloud, it took on a new life, placing me in that world. Kudos to Paul Tevis for the reading.
One more thing: Honorable Mention for Squonk the Dragon by Pete Butler. It was a great change of pace!