All of the following Somerville ebooks are available for download.
Somatesthesia, 2009, Lulu
Many Roads Home, 2009, Samhain Publishing
Remastering Jerna, 2009, PD Publishing
Hidden Faults, 2008, PD Publishing
Encounters 1: On Wings, Rising, 2008, Samhain Publishing
Encounters 2: Reaching Higher, 2009, Samhain Publishing
Encounters 3: Bound to Fall, 2009, Lulu
Interstitial, 2008, Samhain Publishing
Going Down, 2008, Lulu
Rest of Darshian Tales free here.
Cold Front, 2006, Lulu, here.
Part of the Pindone Files, and available free here, along with the rest of the stories in that arc.