As one of the weirdest iPhone 3G cases we've yet seen, Speck's SwitchWay ($35) appears to have been designed for people who can't make up their minds as to how to mount and remove their iPhone 3Gs from their belts. The case actually has two different belt clips, one on each large side of the body, and two separate opening mechanisms that use magnets -- supposedly an iPhone 3G no-no -- to stay shut. This way, you can mount the case vertically or horizontally…