We just used a 580ex ii in a softbox umbrella and a white foam-board for a reflector. We started early in the morning to get the best light.
The first shot was one of few I got with some decent sky. No filter, but it did have some post work on the sky. I actually wish I had paid more attention to ambient light for the sky. This is one of the hundred things that I forgot with all that was running through my mind on this first shoot.
All these were shot with my 450D and either the 10-22mm or 60mm macro.