If only the Wii had supported 1080p or even 720p output, it could have been a great way to browse the web in your living room. Many companies have tried this, but none of them had the correct input device. I think this could have changed the overall direction of technology.
Unfortunately, at 640x480 everything was too small, even back then.
I found even the 256x192 resolution of the DSi browser to be a fine size to use. I don't think 640x480 was too small.