I just found out about this new useful service called Launchlist.
(Thanks @PTthe13!)

This free service allows you, once you’ve finished up designing and programming a website, to generate a report about the project and send it via email to your clients, to let them know their website is online and to remind them of the features it contains at the moment.

Amongst the default features list is stuff like if your website is SEO friendly, IE6 compatible and so on. If your site contains some features that aren’t already listed on Launchlist, it allows you to insert your own custom feature to the report and disable the default ones that you don’t need.

Once all features are inserted, all that’s left to do is to insert your email and your client’s to send it to him.
Quite simple and effective really. Check it out @ http://launchlist.net