Portable dictionaries are very popular in Asia, so it's odd that you don't see more reference texts in electronic form. Here's a natural choice: the NIV version of the Bible, displayed on a 3.4-inch LCD screen along with voice narration for those hard of sight. It even has a built-in hymnal!
While not a Christian myself, I have a fascination for bibles and an even greater one for hymnals. (I collect old editions of both.) I may have to put this model from SAK on the shelf next to the others once it's in the bargain bin.
And bibles in Korea? Turns out a huge segment of the South Korean population is Christian; they're not all Buddhist or Confucian by any means.
SAK electronic Bible [Coolest-Gadgets.com]