OBJ http://creators.xna.com/Headlines/developmentaspx/archive/2007/01/01/Custom-Model-Importer-Sample.aspx BSP http://www.codeplex.com/q3libxna/Release/ProjectReleases.aspx?ReleaseId=3478 MD3, PK3, http://www.codeplex.com/XNACommunity/Wiki/View.aspx?title=Importer%20de%20MD3&referringTitle=Ejemplos Collada https://collada.org/public_forum/viewtopic.php?t=651 http://www.codeplex.com/XNACommunity/Wiki/View.aspx?title=ColladaDemo&referringTitle=Ejemplos ZIP files: http://www.codeplex.com/easyzip Config (.INI File) parser: http://www.codeplex.com/easyconfig LUA http://www.xnua.com/xna_lua_xnua AVI http://www.codeplex.com/ScurvyMedia GIF (Animated GIF) http://www.codeplex.com/xnagif
Blender http://www.betacell3d.com/ (It doesn't have a blender importer/processor, instead a python script is offered in the site that exports the mesh from blender to an open format (bcm & bca) and a custom importer/processor for this open format.)
LDR http://code.google.com/p/ldxna/ - see discussion in forums