QUOTE(Ducis @ May 24 2005, 03:34 PM)
I heard Oblivion isn't using nif anymore, but a newer version from the same devellopers. So nifla will be obsolete

I think the situation might be better than you think. The reason the morrowind exporter only worked on specific versions of max and wasn't available for other 3d programs was because bethesda upgraded their software twice during development and as a result had to do a bunch of custom editing of the format and the exporter making it completely unique and hard to duplicate on other 3d programs.
This time bethesda is using the official nif exporter I believe and they didn't upgrade their their software throughout the development process, so the possibility of them making a blender exporter for oblivion is very good.