Dear Sean and any other Flash gurus...

[btaylor]

Keith

[neuroanatomist]

A reflector will help but personally I don't use them often as I tend to just use another light source. They're very convenient though.

They are indeed! I picked up a PhotoFlex Multidisc recently, and it's very versatile. The reversible cover gives you four surfaces - white, silver, gold, soft gold, and with the cover off it's a diffuser. Does well as fill for naturally-lit portraits.