i have one pet peeve with every photo organizer or gallery i've tried: they are slow.. especially for very large galleries. if you read the original google blog post about how they built photos, a lot of effort went into performance. so i took that as inspiration to start building an open source offline-first organizer that takes this performance to your desktop (and up a notch). its not on github yet, but seeing the enthusiasm here i thought i would ask what else would you want to see in it? my hn username is also my github username, for the curious :)