Four are already fixed by De_Nis. That was some conversion problem. Several models to be build from scratch are on the wiki in Version 2.0 section of TODO:
http://ufo.myexp.de/wiki/index.php/TODOP.S. apart of the grenl_clip2.md2, possibley also /objects/alien/battery/battery.md2 is broken (but I'm not sure it may just be large) and /objects/alien/seat, /objects/furniture/computer, /objects/furniture/trashcan, /objects/vegi/bush, /objects/vegi/cactus, /objects/vegi/chestnut, /objects/vegi/palm2, /objects/vegi/palm3, /objects/vegi/tropic, /aircraft/ufo_small, /aircraft/ufo_big. Generally, broken models have lots of holes and loose triangles in them.
This time I'm paranoid, not to miss anything...
P.S. Try to check models taken directly from SVN, or from recent builds, I guess RC2 should be recent enough.