Lot of web sites uses a login page so you can identify yourself and so that the application can target information for you. I use a lot of different sites and does a lot of logins and I must say most of these login pages are not user friendly.
A login page normally consists of two input fields, for username and password, and a button to make the actual login. In most cases there are a checkbox which you can check to make the application remember your login, by using a permanent cookie. The normal pattern, for us keyboard users are to write in username, hit tab, enter password, hit tab, use space button to check the Remember me checkbox, then enter or tab/space to do the login. This sequence is hardcoded into my brain and I really hate those sites that do not use this pattern.