AmphiSoft Photo Sharpen   
http://photoshop.msk.ru

Photoshop plugin for advanced photo sharpening without forming halos. Provides both object edge sharpen and general sharpen algorithms. Fully compatible with various image editors, like Adobe Photoshop, Macromedia Fireworks, JASC, Corel and Ulead image editors, and numerous freeware like IrfanView and XnView. Plugin work with 8 bit per channel and 16 bit per channel RGB, Greyscale and Lab images.