Relevant or not? Hehehe, i honestly dont know, but i do remember seeing
this (the top article) when it was first posted and it caught my eye. Heres the developers
site . Never used it or seen it running, so couldnt tell you much about it, but it is free (aka something anyone who wanted to try world building could get at) and doesnt look bad. Sure lightwave, smax, or maya would own it, but those cost a couple grand each. Give it a look.
edit: Read the FAQ. Not sure how well it would work without the games specific support. The files are less than 25 megs for the prog and some textures though, so someone with a cable/dsl connection or whatnot could maby dl it and see. Just a thought