For a specific character or team, pick a story you've loved. Ideally it's been published in a trade paperback or hardcover collection. But if it dwells within a Masterworks, Archive, Showcase Presents or Essentials volume, just let us know.
I'll lead it off with one of my favorite Superman tales and that's Kurt Busiek's and Stuart Immonen's "Secret Identity". What a warm fuzzy of a story that respects the source material but with a neat twist. I've only read it once, and need to read it again, but it left an impression.
Unfortunately, one of my favorite Captain America stories has never (to the best of my knowledge) been collected -- I've mentioned this one before: Fabian Nicieza's and Kevin Maguire's "The Adventures of Captain America: Sentinel of Liberty". What a fun story, reminiscent of the old movie serials. It really needs the trade treatment!
So now it's back to you -- what should I be reading?