That were described as "love letters" to a specific comic book character or time period?
Because that is how Brian Michael Bendis and David Mack describe their upcoming Dardevil: End of Days. The two writers are quite talented, and they're working with an amazing art team (Klaus Janson on pencils, Bill Sienkiewicz on inks and Alex Maleev on covers), so I definitely am pretty hopeful that the project will be good, but I dunno, "love letters" seem to have a low success rate, highlighted by Brad Meltzer's "love letter" to the DC Comics Silver Age, Identity Crisis.
Someone name me a good "love letter" comic, please!!