Speck Products has announced its upcoming ToughSkin and SeeThru cases for the iPhone 3G. Originally announced in The Free iPod + iPhone Book 4, the ToughSkin for iPhone 3G is a rubberized case offering a textured pattern that protects the iPhone from accidental bumps and drops while allowing full access to buttons and controls. The bottom of the case flips back for easier docking, and the case also features a removable belt clip. The Speck ToughSkin…