I keep getting an 'Incorrect username or password' error when logging into Blogspot.com, but I'm sure I'm entering it correctly. What could be the problem?

Besides typos, ensure that Caps Lock isn't accidentally enabled. Try copying and pasting your password from a password manager (if you use one). If that doesn't work, it's possible your Google account might be temporarily locked due to too many failed login attempts. Wait a few minutes and try again. If the issue persists, go through the password recovery process.