On a whim, I ran one of the unique identifiers in the Lain game through Google which led me to a couple interesting sites.
A very impressive Russian site is trying to recreate most of the game's content for browsing on the web. What impressed me even more is the creator managed to reverse-engineer some of the game's data types before I did. He kindly gave jPSXdec a shout out since it was used heavily to extract nearly everything on the site.
This very old Japanese site I've seen before, but did a good job of documenting the game's content as well.