Just thought I'd mention a few of my favorite short story writers and some of their work. (These stories can be found and read online by going to http://www.online-literature.com
and clicking on "Author" in the main menu at the top as already mentioned by Dori.) This is my favorite online literature site.The Open Window
by H. H. Munro (aka 'Saki') is a story about a quasi-supernatural event unfolding before a neurotic and easily frightened man. VERY funny story, as is all Munro's work, with one of the great twist endings which are Saki's trademark.A Coward
by Guy de Maupassant is a story about a man who is to engage in a duel at dawn. Another twist ending. Maupassant is an excellent short story writer and I would encourage you to read more of his stories.After Twenty Years
(Found under the collection title of The Four Million
after clicking on the author's name at the website mentioned above) by O'Henry (real name: William Sydney Porter) is the story of two best friends who part but agree to meet at the same street corner twenty years later. Again ... a marvelous twist.
At this same site are the complete collections
of the three authors mentioned above plus the complete collections of other great short story writers like P. G. Wodehouse and Anton Checkhov. You will also find that many well known novelists were also writers of short stories. By checking the menu to the left of the page at each author's section you will find the author's entire life work broken down by type ie. short story, novel, poetry ect.