Percy Jackson and the Olympians

This series by Rick Riordan sure sounds fun. Here's the description of book one, The Lightning Thief:

At first glance, Perseus Jackson seems like a loser (readers meet him at a boarding school for troubled youth), but he's really the son of Poseidon and a mortal woman. As he discovers his heritage, he also loses that mother and falls into mortal danger. The gods (still very active in the 21st-century world) are about to go to war over a lost thunderbolt, so Percy and sidekicks Grover (a young satyr) and Annabeth (daughter of Athena) set out to retrieve it. Many close calls and monster-attacks later, they enter Hades's realm (via L.A.). A virtuoso description of the Underworld is matched by a later account of Olympus (hovering 600 floors above Manhattan). There's lots of zippy review of Greek myth and legend, and characters like Medusa, Procrustes, Charon, and the Eumenides get updates. Some of the Labors of Heracles or Odysseus's adventures are recycled, but nothing seems stale, and the breakneck pace keeps the action from being too predictable. Percy is an ADHD, wise-cracking, first-person narrator. Naturally, his real quest is for his own identity. Along the way, such topics as family, trust, war, the environment, dreams, and perceptions are raised. There is subtle social critique for sophisticated readers who can see it. Although the novel ends with a satisfying conclusion (and at least one surprise), it is clear that the story isn't over. The 12-year-old has matured and is ready for another quest, and the villain is at large. Readers will be eager to follow the young protagonist's next move.

The fourth book in the series was recently well-reviewed by the LA Times.

Percy Jackson and the Olympians by Rick Riordan.