Here's the information promised about the E-Commerce Directive. A point about required information to be provided on commercial and non-commercial websites came up during the DENIC pressentation on WHOIS. This information tries to explain the EU-wide requirement that contact information be provided on commercial websites.

Paragraph 17 of the recital (on page 3) describes what's meant by an 'information society service provider', generally understood to be a commercial venture; "any services normally provide for remuneration, at a distance, by means of electronic equipment for the processing (including digital compression) and storage of data, and at the individual request of a recipient of the service". There is a description of different possible kinds of information society service providers in paragraph 18 of the recital.

Article 5 of the Directive proper (on page 10) on 'general information to be provided' describes the information required. It's required to be easily accessible, but there's no ongoing accuracy requirement.