.NET Password field that looks like Windows XP password field
Here's a trick to make your regular .NET TextBox to have a look similar to Windows XP password field, where it displays large black circles instead of asterisks (****) to "mask" the password (see the Password field shown in the screenshot below):

This trick is fairly easy, and it doesn't require you to perform any complicated owner drawings.
Here's how:
1. Add a TextBox to your Form
2. Set the Font of that TextBox to Wingdings (not Webdings)
3. Set the PasswordChar property to small letter L ('l').
And you're all set, quick and easy.
If you want your password field to have customized look and feel other than the one I described, you may want to experiment using different characters other than small letter L, or use Symbols Font, for more symbols.
Happy coding
-chris