Marty has a DSLR camera and when she shoots video, she hates the quality of the audio. What can she do? Leo says that the on board microphone is terrible, but most DSLRs have an external microphone minijack that will allow her to add an external microphone. Rode has a great one called the Video Mic Pro. That's the simplest solution.
There's also an adapter from Beachtek called the DXA-SLR Mini that will allow her to plug in any microphone via XLR plugs. Leo also says that it's a good idea to avoid cheap wireless microphone solutions, and stick to wired.