Not long time has passed since Irrlicht received its own file formats (.irr for scenes and .irrmesh for static meshes), because it originally only included importers for external file formats. That's also the reason why there are not that much .irr and .irrmesh exporters yet, but there are some few. One is irrb, a Blender to Irrlicht exporter
It is hosted on google code
and open source of course. Currently, only static meshes are supported, but as you can see on their website, it already is very useful.