What import/exports support animation?

I’m trying to integrate Blender with other 3D apps and need to transfer an object’s animation properties into and out of Blender. Is .X the only real option? How about .3DS?

I found 5 directX export scripts, any hint’s / tricks to getting it to work right?

I’ve got some rigged/animated characters that I want to bring into Blender and am having problems getting everything working…