Asiekierka, I just wanted to point out that if we had the common key it would help homebrew as well as piracy. Although common key != DSi mode homebrew or piracy, further work will have to be done (afaik). Simply because with the common key the DSi system menu can be decrypted, then an exploit to allow homebrew installation needs to be found. But without the common key it makes homebrew installation harder.
Also WiiWare & Virtual Console files need to be signed with the truncha bug to be ran on a Wii & hence some similar setup will be needed for DSiWare (I assume) & hence finding the common key may enable people to download DSi Ware, but not run it. Not trying to convince you of anything, just don't want you thinking common key only brings about piracy when it can also help homebrew.
R.I.P Brutey?