Came across these sites this morning:
WiiCade Site full of flash games that should work great with Wii and Opera when it's launched.
SWiiTSPOT - Nintendo Wii Portal This is a neat idea, a website aimed at dedicating a hassle-free web surfing experience for Wii users. SWiiTSPOT.com is currently developing it's site as a convenient launch pad to enable Wii users to view their favorite web content with as minimal "hunting and pecking" as possible. Looking good so far.