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With the exception that game devs don't usually use it since it is a text based format and takes much more time loading than a binary format... Collada is probably the "hip" format at the moment. FBX is making its way too. But I suggest that you just use the formats you are most comfortable...

If you are using blender for the 3d models, you could allways write an exporter to your own format. Its quite easy actually. Dunno really what would be a good 3d model format with keyframes, md2 is one very common format (as you probably know) but it has its restrictions which can be somewhat...