A great start.
I would like to see an iPad native version as well as the iPhone/iPod version. A wider variety of bricks, and a way to save builds for tinkering would be nice as well. Im sure that if it were possible to import or export the LDD files, that there would be those who would love that. Maybe it could export a list of bricks, instead of the full LDD file? For myself, I think the ability to creatively "sketch" a build and keep it in a library would be pretty darn good. The ability to set scenes that stick, or are just simple color fields would be handy too.
Its a good start, easy and intuitive. Keep up the good work :)
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Bricasso