Shuttertalk have taken a look at Focal Blade, a PC-only sharpening plugin for Photoshop:

“FocalBlade has been around since 2003, and met with favorable reviews early on. As I was quite satisfied with my sharpening workflow at the time, I was hesitant to pay for yet another program claiming to be the holy grail of digital image sharpening. Having already tried Nik Sharpener, modifications of Fred Miranda?s old EdgeSharpen action, and numerous other techniques, I wasn?t fully satisfied with any of them and expected FocalBlade to also disappoint. Now that I?ve gotten my hands on a review copy, I?ve decided to put it to the test.”

Website: Shuttertalk - FocalBlade Review