The latest adition to the Nokia N900 app store is “TowerBloxx Delux 3D” which Nokia have previously had on their S40 (i.e. 5310) and S60 (i.e E71) handsets, and now it comes to the N900 (You might have also seen it on the iPhone!).
You can find it on the second page of the Games section in the Ovi Store via your phone or via online: store.ovi.com.
It’s a simple but good game, just try to build a tower block as best as you can by dropping sections onto each other, but the wind will sway the blocks so you have to time it right! The quicker you do it, the more people it will house and the more points you get.