The first is "End of the World", the story appearing in prof_brotherton's online anthology Diamonds in the Sky, consisting of astronomically correct Science Fiction stories written by graduates of his awesome Launchpad workshop (which I was privileged to attend in 2008). You can read the story here
The second is "Choice", appearing in the webzine "Edge of Propinquity" edited by jennifer_brozek, and it is available to read here
The third is "To Remember Riobarre", appearing in the Winter 2009 issue of Space and Time magazine - not available online, but I will be happy to provide a reading copy if anyone eligible for nominating the story can't find the magazine and is interested in reading this particular offering, just email me and ask.
And, of course, if anyone wants to nominate "Cybermage" for the Andre Norton Award, now's the time to do this, too...