[[the mibbit thing got somehow reverted to connect to the old server. It will be working again as intendet as soon as possible. Thansk for the hint.]]
If you want to use your browser i suggest to get the Addon Chatzilla.
The Server is: irc://irc.wiihacks.com/wiihacksgood luckCode:irc://irc.wiihacks.com/wiihacks
edit: actually the chat button itself is working, maybe delete your browser cache/history, or if you access mibbit some other way, change the server settings, from efnet to wiihacks.
edit2: wii browser?? you want to chat using the wii? what a pain