I really liked how Ernesto Hoost would set them up. But since this is the UFC forum, I'll go with Antoni Hardonk.
Bola Omoyele vs. Manny Rodriguez on TUF: Australia vs. UK. Bola dropped Manny with a leg kick that fractured his leg. Manny somehow came back to submit him though. Crazy
Strange, forgot about Ricardo Arona. Never payed attention to his kicks outside that one Wand fight. Only thing I remember about him is everyone would talk about how good is grappling/bjj is, but he'd never go for subs, it was always about LnP. Always kept his chin straight in the air too.
Besides Overeem I wouldnt say the kicks themselves have done a ton of damage but they really were great at setting up takedowns as they typically landed to the back to the knee, almost trips from distance.
<img src="http://i209.photobucket.com/albums/bb5/bobbyd963/mmmmmmmm.jpg" alt="image" /> maybe not the MOST brutal but he did break monson's leg.