As of Minecraft 1.2, the seed no longer appears in debug (F3) output. I’d be interested in knowing what the world seeds are so I can use one of the slime chunk finding tools. Is this something that can be provided? Or are there exploits that we need to worry about if the seeds become widely known? Or is this itself considered an exploit???
NOTE: I understand that much of the world was generated with older versions of minecraft, so while the biomes/land may vary if the seeds were plugged into a current client/server, I don’t think (although I could be wrong) that the slime chunk algorithm has changed (or if it has, I assume they spawn based on current algorithm).
Seeds were removed from the debug screen because many servers — for survival purposes — didn’t want people generating the same world and flying around to find stuff. It probably should be optional, but it’s not a big deal.