Dolphin Emulator forum user, dentnu, has posted some beautiful HD screenshots of Donkey Kong Country Returns running in 1080p HD using the Dolphin Emulator. He says,

Here are a few pics with these settings and I am getting 58 FPS rock soild

1920×1080, DX9, 16x anisotropy filtering, EFB scaled copy,

EFB copy to Texture, use native mips, enable dual core,

enable idle skipping, lock thread to cores, JIT Recompiler, Frame limit OFF

According to the forum post, his system specs are,

CPU: Intel Core i7-960 OC 4.5Ghz @ -40c

Motherboard: Evga Classified X58 E760 MortherBoard

Memory: CORSAIR DOMINATOR-GT 6GB DDR3 1600

Power Supply: Thermaltake 1000WATTS

Graphics: EVGA Geforce GTX 480

Cooling: Custom 280 Watts Cooler Express Phase Change

Dolphin is an open-source Nintendo GameCube, Wii, and Triforce emulator for Microsoft Windows, Linux, and Mac OS X (Intel-based). Checkout all the screenshots below,

Click on image to view full-size