Please be aware that there is some spoiler information in the synopses - which are reproduced from the copy on the back of the UK editions - and use with care if you haven't yet read all the books in a series...
The volume was painstakingly compiled by Lavie Tidhar and annotated, with various explanatory notes and anecdotes, by Michael himself. The book was published by Pete Crowther's PS Publishing, and they should be your first port of call if you'd like to buy a copy.
Alternatively, go to the Full Bibliography page to see an alphabetical list of Michael's published fiction, including his short stories, to date. This list is updated regularly, so check back every so often or subscribe to the RSS feed on the News page, where updates will be announced.