Big nerd. As an example, I run the White Wolf Wiki.
My programming skillz are sadly not very up to snuff. One project I would absolutely love to see on the DSi or Wii is an SCI emulator. The old Sierra point-and-click adventure games are perfect for the DSi. Controls are easy: Stylus = mouse.
Unfortunately, the best SCI emulator out in the wild is FreeSCI, which currently only covers SCI0 games, which are all parser-based rather than point-and-click.
I got a DSi for Christmas this year (2009), and having enjoyed homebrew on my Wii for over a year, I can't wait to get a homebrew channel on my DSi as well.
My hat goes off to all the hardworking people who've put together the Wii & DSi Homebrew communities.