Many of you may have seen this already, but the Damage Calculator by luungoc2005 should be a part of any competitive player's arsenal. This thing has it all: smart searching, easy customization, C/P-able damage outputs and a pretty interface. Some movesets are a bit behind, but most are available and adjusting details is easy. Microsoft Silverlight is required for the calculator to work, but it's an easy installation for both Mac and Windows. Give it a try here.