Hi Paul,

You mentioned above about the videos of Mark Wallace, and I have found them invaluable. Here is some links to his 1 on 1 series on youtube.

Digital Photography 1 on 1: Episode 25: Metering Part I
Digital Photography 1 on 1: Episode 26: Metering Part 2: Exposure Compensation
Digital Photography 1 on 1: Episode 27: Metering Part 3: Using a light meter
Digital Photography 1 on 1: Episode 28: Metering Part 4: Advanced Metering

Cheers,
Sean