I've reached the Twilight Realm (pretty much the endgame AFAIK) and have only 16 hearts. Considering doing that required me to get something like 30 PoH (just dungeon-crawling with no heart piece hunting only gets you 10 HCs in this game since it trades dungeon-crawling for side-questing), I think that's pretty impressive. However, by my calculations I'm only half done; I'm missing about 20 more PoH if it's possible, like in all other Zeldas, to get to 20 HC.
Anyone know a good resource, with pictures and descriptions, for getting all 50 (!!!) PoH? Obviously I missed a lot.