I just got off the phone with a very nice examiner at the US Copyright Office to make sure I have the latest facts and procedures.
She strongly advised people to look at Circular 66: http://www.copyright...rcs/circ66.html
regarding website registration.
The process is simple - make a copy of your website, and put it on CD-ROM. Print (yes, on paper - that stuff you get from trees - no PDF's) out a few representative pages, such as your home page, an article or two, and so forth. You could print out the whole site but I wouldn't unless it's a small one. Then fill out the form and write a $30 US check to Register of Copyright and mail the package. You can use regular mail, but I strongly recommend registered mail.
In practice, the examiner only looks at the printed papers - *not* the whole CD. If they have any questions, they will contact you - if you are not in Canada or the US, she asked me to tell you guys to please make sure you give them a valid email address - they like to use email if possible.
Your copyright is protected from the receipt of the payment and copy in the office - it can take up to a few months to get the actual certificate.
If you have previously registered a website and want to register the most recent changes, you can either just register the changes, or you can ask for them to just add the changes to the original copyright, if they were minor.
Remember that facts are not copyrightable, so if you go back and change a fact in your old article it's still protected as of the original date because the fact itself wasn't copyrighted in the first place.
As for electronic postmarking and copyright protection companies, they offer no special rights or priveleges, but they do offer a simple way to prove publication on a certain date.
They also mentioned that there is a special project in the works that will allow websites to be registered automatically and easily, but it's not available yet.