Dricore is quite popular actually, it's 2'x2' waferboard tiles with a plastic backing. It's used as a subfloor in a basement. If you get a bit of water it will just go under. It also acts as a thermal barrier so the floor feels much warmer.
I used it because my floor is unworkable, it's very rough concrete that is very dirty. You can't put anything on there as it would be uneven and anything glued/cemented in like tile would pull up.
I'll probably end up using the dricore as my floor, might varnish it. In the far future I can always put down a real floor.