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LEGO-touch is an application for designing LEGO creations on your iPhone or iPod Touch. From the website:

View, post, build, or edit other LEGO maniacs projects. Create your own LEGO characters in pals, post your LEGO self to represent in share. Play and download different LEGO games or challenge anyone to a build-off! Personalize your bricks with color-slider and more…

The community aspect of this software seems pretty interesting to me; collaborative designs, perhaps! – Link.