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If you liked Nabari no Ou add

...then you might like Pandora Hearts add

Though they're both thrust into dangerous, unfamiliar situations, the protagonists in both anime are similarly detached from their predicaments. They're also of a similar age group (14/15). Recurring characters include... the older, concerned guy who starts to act like their mother; the spunky and dominating "girl warrior" type.
Both anime also have some very obvious yaoi overtones.

If you liked Kuroshitsuji add

...then you might like Pandora Hearts add

Similar setting: rich, somewhat arrogant noble kids, older (and hotter) servants, Gothic styles. Both try to present a fantasy world that resembles a historical European setting to various degrees, but with the critical aspect of the story based on a supernatural twist. In Kuroshitsuji, it is the concept of demons and angels. In Pandora Hearts, it is the "Abyss," a dimension where time is warped. Both protagonists have been bestowed with a sort of life-binding curse that they view as a punishment, yet ironically neither seem to value their lives very much.
Kuroshitsuji is much darker in tone than Pandora Hearts, however. It is quite heavily Gothic, while PH adheres to more typical anime conventions.

If you liked .hack//Sign add

...then you might like Pandora Hearts add

The most obvious resemblance is their music composer, Yuki Kajiura. The musical style she uses in both anime are very similar, dominated by emotional piano pieces, violin solos, techno beats and haunting vocals.
The general premises of the two anime are also similar: young ineffectual boy encounters disaster and is thrown into a foreign world, gains a unique power, struggles with his sense of identity and his acceptance of his existence itself, learns to be more courageous through the course of the story, develops an attachment to female protagonist, etc.
Both anime also have a pervading atmosphere of unreality (protagonists protect themselves through denial), fear, and angstiness, while almost every character has a hidden dark background, uncertain motives, crippling weakness, etc.