My new extension, Builder, is now live on the Extensions Warehouse! http://extensions.sketchup.com/en/node/3106
It has been designed from the ground up as a straightforward, powerful and intelligent extension to automatically produce cutlists and cost summaries for your model at any point in the design process. It will output a quick, instant cost summary within Sketchup, graphical HTML cutlists for easy printing, and Microsoft Excel spreadsheets.
There is no need for any use of custom materials within Sketchup, naming conventions for components or adding tags to the description - simply give Builder a list of the materials you are using (e.g. 18mm plywood 8’x4’ sheets), their sizes and what they cost and Builder will automatically assign components in your model to the correct material based on their dimensions. This is also able to be overridden by adding a material name to the component name for complete flexibility. On top of automatic assignment, Builder will error check your model for any components that have incorrect dimensions, helping you to model more accurately.
Currently this is only a free version that is limited to nesting up to 50 individual parts - I will be releasing Builder Pro (unlimited parts) as soon as my vendor account has been setup. In the meantime, please do install and try it out - I will do my best to attend to any bugs and feature requests before the Pro version is released. Happy modelling!