Are there any definitive collections, the way there are with Howard, Lovecraft, Leiber, Moorcock?
Dunsany doesn't have any big omnibus's of his short stories, it seems... and I can't find much on that front for Smith, either. I've never read them and I'd like to.
Maybe I should post this on a forum dedicated to one of them rather than here, I don't know.
I don't read Dunsany but I can help you with Clark Ashton Smith. There's another Topic on Clark Ashton Smith. Search, Find it, and not only will you find everything you needed to know but also a really cool color picture of the house he lived in!
If you haven't had a chance to get a Kindle it's a great way to instantly read stories at 85% of the cost of a book. The cost was only $1.99 and estimated pages 1812.
133 Weird Tales-era works of horror, science fiction and fantasy have been gathered here into one volume, all written by Clark Ashton Smith, who was the third member of the literary circle that included authors Robert E. Howard and H.P. Lovecraft. Excluding only fragmentary notes, excerpts and synopses he never finished during his lifetime, this is perhaps the largest single collection of all his published and unpublished fiction.
Look at the Ereader section sometime.
I just downloaded -
The Ultimate Weird Tales Collection - 133 stories - Clark Ashton Smith (Trilogus Classics) [Kindle Edition]