Most password-protected sites (whether protected via HTTP Basic Authentication or otherwise) are that way because the sites' owners don't want just anyone to look at the content. And it would be a bit odd if I gave away such a username and password by mentioning it in this book! However, there is one well-known site whose content is password protected without being secret: the mailing list archive of the Unicode mailing lists.
In an effort to keep email-harvesting bots from finding the Unicode mailing list archive while spidering the Web for fresh email addresses, the Unicode.org sysadmins have put a password on that part of their site. But to allow people (actual not-bot humans) to access the site, the site administrators publicly state the password, on an unprotected page, at http://www.unicode.org/mail-arch/, which links to the protected part, but also states the username and password you should use.
The main Unicode mailing list (called unicode) once in a while has a thread that is really very interesting and you really must read, but it's buried in a thousand other messages that are not even worth downloading, even in digest form. Luckily, this problem meets a tidy solution with LWP: I've written a short program that, on the first of every month, downloads the index of all the previous month's messages and reports the number of messages that has each topic as its subject.
The trick is that the web pages that list this ...