Making my fiction available online

I’m considering making my first two published stories more readily available online. My first story, “When I Kissed the Learned Astronomer” is still available online at InterGalactic Medicine Show, but you have to pay for the issue. My second story, “Hindsight, In Neon” is only available in the Descended From Darkness anthology in print and eBook formats. It is no longer available on the Apex website as a free story.

I’m open to suggestions from friends and fellow writers as to how best to do this: Kindle and iBook? Other formats? Anything I should know about making these stories available. Post suggestions in the comments, or send me email directly.