I shot a short performance where I'm giving client a file he can use in his iMovie. What shall I export for him. He has the latest iMovie, so I assume it can handle HD. So, if you can give me some advice, please suggest an HD format, and an SD format, to be on the safe side. Original was shot in 1080 / 30p. Thanks.

AIC (Apple Intermediate Codec). It's sort like the consumer version of Apple ProRes. He'll get a very good quality HD file to work with.

Final Cut Pro 7 Professional Formats and Workflows (http://documentation.apple.com/en/finalcutpro/professionalformatsandworkflows/index.html#chapter=10%26section=6%26tasks=true)

Apple Intermediate Codec - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Apple_Intermediate_Codec)