Electron Shepard is now selling a GCVideo-based HDMI kit for Nintendo Wii Consoles. The price is a (relatively) low $80 plus shipping and it's compatible with all versions of the Wii, except the Mini; Previous versions of Wii HDMI mods were only compatible with a select few. You can pre-order now
AV Cable for Nintendo Wii (Styles May Vary)
How to use a Nintendo Wii on a new TV
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Nintendo Wii Connector to HDMI Adapter
Game Boy Advance SP IPS V2 Kit with TV Output Mod - Play Your GBA on Your TV | Hand Held Legend
AV2HDMI Problems : r/wii
Wii HDMI For Launch-Model Wii's
Wii to HDMI converter for the Wii console, outputs video and audio in full digital HDMI format and supports all Wii display modes (NTSC 480i 480p, PAL
Portable Wii to HDMI Wii2HDMI Full HD Converter Audio Output Adapter TV White
WII to HDMI Converter Adapter 720P 1080P HD Video Audio Upscaling For Nintendo
Are the GameCube component cables really worth the $200 over playing HD on the Wii? : r/Gamecube
Full-size HDMI Wii using Electron Shepherd's Analog2HDMI. : r/WiiHacks
Wii System - with WiiDual kit (HDMI + RGB) - RetroAsia
Connect your mini DisplayPort equipped MacBook, laptop, or PC to an HDMI display using this Mini DisplayPort to HDMI Adapter from Monoprice. This is a passive adapter, which requires no additional power. It converts the mini DisplayPort signal to an HDMI audio/video signal. The adapter supports resolutions up to 1920 x 1080p and up to 36-bit Deep Color (12-bits per channel).
Monoprice Mini DisplayPort 1.1 to HDMI Adapter - Black with Audio Support