I think 'The Wendigo' is among the best Blackwood stories. It has this terrifying and otherworldly creature, the Wendigo. Blackwood does an excellent job of building up the horror and making the reader feel the cold and fear that the characters experience in the story. It's full of suspense and a great exploration of the unknown in nature.
Sure, it is. This book has the elements typically found in literary fiction like deep exploration of human emotions, sophisticated language, and a focus on character development.
The 'tomorrow and tomorrow and tomorrow short story' might have a theme related to hope or the lack thereof. If it focuses on multiple 'tomorrows', it could be showing how characters either look forward to the future with anticipation or are trapped in a cycle where each new day (tomorrow) is just like the last. Without reading it, it's hard to say for sure, but these are some common interpretations in literature related to the idea of successive days.