GameSpy has gone live with the first details anywhere of the Nintendo DS, which is apparently Nintendo's "mystery" system that will be formally unveiled at E3. The system is said to contain two separate 3" game screens in a portable device. Here's an excerpt:

From information made available today, players can look forward to being able to simultaneously manage their game progress from two different perspectives, enhancing both the speed and strategy of the challenge. For example, players will no longer be forced to interrupt game play to shift perspective, such as moving from a wide shot to a close up, or alternating between a character's ongoing battle and a map of their environment. Nintendo DS makes it possible to perform the tasks in real time by simply glancing from one screen to the other. Today's announcement is but a glimpse of the additional features and benefits that will be shown in full at the Electronic Entertainment Expo (E3) in Los Angeles in May. Once fully revealed, players will see innovative advances in game interaction.