Mobile
Get flash to fully experience Pearltrees
lovely ui
about / buttons / coach marks / compose / coverflow / dashboard nav / empty data sets / feed / graphs / launch screens / lists / maps / navigation / notifications / popovers / profiles / search / share / slider / stats / sub navigation / textures / thumbnails / typography / walk throughs /Web Design & CSS Inspiration for the iPhone — CSS iPhone
An interesting use of colors for the mobile screen.