I don't know if anyone owns or has played Viva Pinata, but they have announced a DS version (and PC version) of the gardening-sim game.

I actually just bought the 360 version two weeks ago and I absolutely love it. Though the graphics are obviously going to be downgraded to the DS, the same team who made the 360 game will be working on both versions (PC and DS), so both are bound to be as great as the original.

I'll be keeping a close eye on this title seeing as the original is so awesome.

Here's two links:
IGN Article
Pinata Island Forum Topic

They aren't completely "owned" by Microsoft. Remember Diddy Kong Racing DS? Rare helped make it. So this isn't the first time it has happened, and I wouldn't be surprised if they made another game for the DS.