Dear Esther is described by the game's web-site as "a ghost story, told using first-person gaming technologies. Rather than traditional game-play the focus here is on exploration, uncovering the mystery of the island, of who you are and why you are here. Fragments of story are randomly uncovered when exploring the various locations of the island, making every each journey a unique experience."
We have known for over a year now the outfit behind the game was planning to release a native Linux port, a game powered by the Source Engine. After Valve publicly announced their Linux love and people began to understand the Phoronix reports as real, it was reaffirmed Dear Esther would be coming to Linux.
At the end of May, Dear Esther was part of Humble Indie Bundle 8. This latest bundle is now over after grossing $2.6MM USD, but the native Linux port is now available. The initial Linux game release as part of the bundle was using a Wine/CrossOver-based implementation, but now the first build of a native port done by Ryan Gordon is now available.
This change was announced on the Humble support site. "Ryan Gordon has released the initial native Dear Esther Linux build! The initial version is now on your download page. It is still being worked on, so stay tuned for updates!"