Merl Reagle's crossword in today's Los Angeles Times is titled "Twice-Told Tails." Each theme answer ends with repeated letters. Examples: RINTINTIN, DADOORONRON, CHIHUAHUA, HONOLULULULU and KINGKAMEHAMEHA.
Reagle has said that he creates his puzzles without the aid of computer software. I've noticed that he often winds up with weird strings of letters and then has to find a way to clue them. Today he has INA ("___ nutshell"), INB ("Bach's Mass ___ Minor"), PPD ("Game-delay abbr."), RTENO ("66, for one: abbr.") and ZIN ("Fruity red wine, familiarly"). But who knows? Maybe the Crossword Compiler program couldn't have done any better.