I find sites that hide the login form to be extremely annoying, including Twitter. Keep the login form visible at all times and don't require an extra click for

I find sites that hide the login form to be extremely annoying, including Twitter. Keep the login form visible at all times and don't require an extra click for your users. LinkedIn also hides its login form on another page - it assumes you want to sign up if you land on your profile page (e.g. from a bookmark) but you're logged out.