Buy Mark's Studio Lighting DVD:
http://www.studiolightingessentials.com
This week Mark discusses image resolution and file size and talks about how large you can print with different cameras.
The spreadsheet is available for download here:
http://blog.snapfactory.com/wp-content/uploads/2012/01/Camera-specs.xlsx
Episode 41: Dynamic Range
http://www.youtube.com/watch?v=TCPz52rCDS4