Based upon one of the highest-rated cases for the iPod touch, DLO's new VideoShell for iPhone 3G ($20) is a generally convenient clear hard plastic shell with one serious issue. While we continue to like its flip-out integrated video stand, which lets you easily watch movies or TV shows on the iPhone 3G, we found the case almost impossible to remove from the device once installed, even when following the directions -- an issue that will seriously…