While I'm still out on the fence as to what my opinion about Miller's movie is, I figured it'd be a good time to share how I discovered the character with my blog-reading friends...
Like many fans my age (who grew up in the late 1970s and 1980s), I first discovered both Eisner's work and his creation Denny Colt in the Warren Publications magazine of the mid-1970s.
Again, with the Wikipedia stuff:
Warren Publishing and later Denis Kitchen's Kitchen Sink Press published extensive reprints, first as large black-and-white magazines (the Warren part of the run eventually having a color section), then as trade paperbacks. The magazines often featured new Eisner covers.
Two new stories were written during this period "The Capistrano Jewels", a 4-page story published in the second issue of the Kitchen Sink reprints in 1972; and "The Invader", a 5-page story (reprinted in The Will Eisner Color treasury).
In 1976, an oddity called "The Spirit Casebook of True Haunted Houses and Ghosts" was published. The Spirit plays the EC host, introducing "true" stories of haunted houses. The Spirit makes a cameo in Vampirella #50.
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The Spirit Magazine #1 CBZ file