I only realized today that I voided my warranty. Bummer! So I was browsing for some sweet homebrew (can't find nuthin') to take advantage of my now non-reparable Wii, and I came across this in a blog post by one of the authors of the Homebrew Channel:
yes, nintendo can track it if they want, and we can’t do anything about it. Heck, we even made it show up on the use history. Nintendo isn’t going to do anything destructive about it (i.e. brick your wii) because that would get them into a big lawsuit. Don’t worry about it - the homebrew channel doesn’t present a direct threat to Nintendo, and the most they’ll do, if at all, is try to block it in future updates. The fact that they could (with certain code) see if it’s installed doesn’t mean anything.
That should allay some fears that this channel might brick your Wii.
 It's comment no. 21 on this blog post