The UK’s Carbon Trust has just launched a new carbon labelling scheme for consumer products (their examples on the website include crisps/chips, shampoo and fruit drinks). With luck, Walkers Cheese and Onion crisps will be available mid-April 2007 and Boots’ Botanics and Ingredients shampoos in July. Innocent Smoothies will be described on their website soon.
To qualify for the scheme, a company must go through a carbon auditing scheme and comit to reducing the carbon footprint over the subsequent 2 years. You can read the summary and detailed methodology if interested 
This is a fraught area and I’m sure that there will be much discussion about the methodologies used – it’s a debate related to becoming carbon neutral – but putting a defined set of principles into practise is a bit step forwards.
