Good source for Homebrew I have found is
Wiibrew.

You can hack up to update 4.1 (using Banner bomb) as far as I know. The twilight hack has been superceded now, but works with older firmware.
Easy peasy Homebew installation here

I just Bought Okami for the Wii. Nice! I have it for Ps2 and love it more than a man should love a game, so the chance of playing it in widescreen and with lovel 480 p was too hard to resist. They have softened the paper effect on the background a lot though. Had to import it from UK as no-where in Australia seems to have it (well Perth anyway, not suprised there!). I read an interview with Capcom and they said they won't make a sequel as the first game didn't sell well enough. Probably coz they didn't distribute it much and no-one can get their hands on the bloody thing....