Model formats

Just a post to ask what model formats you guys use. I''m considering using one of three or four different formats, and am curious to find out what everyone else uses. Basically i''d be looking for one which contains animation data, so I was looking at MD2/3 format. However, the modelling guy will be using 3DSMax, and I am unaware of any tools that can help convert to these formats (any ideas??) Does anyone use the DX skinned mesh stuff? Does anyone know of any docs regarding the keyframe data stored in 3ds files? I mean, I have the format, but not quite sure of implementation details. Thanks in advance..