We know the Wii Shop Channel was updated yesterday to allow those who'd bought the Internet Channel to claim their free NES game, but the DSi Shop Channel was updated as well, bringing with it rumours of a future launch of a DSi voice chat channel.
According to Kotaku, those quick enough to access the DSi Shop Channel soon were met with error code 206602, which initially linked to a Nintendo customer service page mentioning the DSi Speak Channel. It's since been removed, but Google reveals a cached version of the page's content:
"To redeem a Nintendo DSi Download Ticket number, such as for the Nintendo DSi Speak Channel, enter the number off the Nintendo DSi Download Ticket..."
This information is now sadly long gone, but this is a clear indication that the DSi could be getting its own online chat channel. How it will work is unsure - will you send voice messages to your DSi-owning friends or could it be used in-game to chat with other gamers? Time will tell on this one.