The Nintendo 3DS utilizes a similar title-based organization as seen in the Wii and DSi platforms. The same update server is being used as was with the DSi, however a new common key has been introduced.
The organization of Title IDs has not been documented fully yet.
Here are some confirmed Title IDs (from the first update):
0004001000025000 (Promotional video?)
0004013800000002 ("System Menu"?)