European Community Directives are being increasingly used by manufacturers to label their more sustainable products. Here's a quick review of 3 key directives and 5 codes of conduct:

Only one has a standardized symbol for labeling compliant equipment: WEEE, as shown above.

The EU has also established voluntary energy efficiency codes of conduct to which manufacturers and service providers can commit.
Code of Conduct for Data Centres
Code of Conduct for Digital TV Services
Code of Conduct on Energy Consumption of Broadband Communication Equipment
Code of Conduct on Efficiency of External Power Supplies
Code of Conduct on AC Uninterruptible Power Systems (UPS)