The domain names are not case-sensitive. However, the entire portion past the .com/ IS CASE-SENSITIVE in Linux and Unix systems. Since most reliable servers run Unix or Linux, you'd best get used to the issue.

The Google admin staff rarely tells you the straight scoop and always seems to want to change its mind. Heaven forbid you learn how they actually analyze your site!

This is part of the reason why most marketers are list-oriented and use targeted e-mail to reach prospective customers. Google only gets those that are searching for a specific keyword. Email reaches those that have previously been interested or are current or former clients. With a valid link to your URL in the email, you needn't worry about the user mis-typing the link.