30, hey? Solid number. Very nice.
However, this doesn't mean it'll have at least 30 games by launch, this is just how many they could be showing at E3. Though the fact that they've got that many to show is pretty impressive nonetheless.
The games, especially if there are some AAA titles, will probably be spread out release date-wise just because that's a smarter thing to do to maintain interest in the system and to have steady sales.
I wonder if the system's really easy to develop on, or easy to port to? That might explain that solid number.
I saw a preview video of "Death Jr.", a game on the PSP, so if the DS is going to compete against the PSP (despite the fact that they say it doesn't directly compete with it, it would still probably have to), hopefully it has impressive 3D games. I love "oldskool" games, 2D games, simple games, and graphics don't really matter to me, but I'm sure it will matter to a lot of people.