Glad you liked "The Open Window". My first exposure to that one was a recorded dramatic version adapted for younger listeners, Alfred Hitchcock Presents Ghost Stories for Young People (which began with a terrifically truncated and altered, but nonetheless quite chilling, adaptation of Bulwer's "The Haunted and the Haunters"); I never forgot it, and when I came across Saki's name in a Whitman children's book, More Tales to Tremble By (the story was "Sredni Vashtar"), I knew I was in for something good.....
If you've enjoyed the Saki, and you've not read him before, you might want to give John Collier a try. Look for one of the many editions of his Fancies and Goodnights, a nice selection of his rather unique tales.
As for myself... my reading time has for some long while been whittled down to practically nothing, but I have begun a re-reading -- for the first time in almost three decades -- of the entire collection, The King in Yellow, by Robert W. Chambers. I've read two or three of the stories from it various times over the years, but this is the first time I've read the collection as a whole in a very, very long time. I must say that, if anything, this is one which continues to improve with age. The seemingly simple, yet elusive, dreamlike air of this volume (even the Latin Quarter stories, at least the first of them, which is as far as I've come so far) makes for a haunting, eerily disturbing feeling of our accepted reality being little more than an illusion we use to putty over a reality which is thoroughly appalling in an almost unidentifiable way. The strangely meaningful (in an obscure, never defined fashion which resembles those impressions of inherited memory we sometimes experience) references to the play The King in Yellow gradually weave a tapestry of a world where this (the play) is the reality, and the quiet terror is all the more effective for remaining just out of reach.