On forgetting the remember me checkbox.
openideas.ideon.co
openideas.ideon.co
Slashdot, news.yc, reddit, fark or digg aren't exactly the most important of my accounts. I sure wouldn't want my bank to leave me logged in by default, but I find the rest of my accounts to be near worthless.
Fortunately, my browser usually asks me whether it should remember the login information after the page is loaded.
This submission is about server-side (cookies or likewise) though.
Remembering credentials is a feature of the browser, some will let the page load through (letting you check that the credentials are correct) while others (safari does that I believe, and it's extremely annoying) block the whole UI and force you to hope you didn't make a typo, or they're going to store the wrong one (though they'll ask again when you enter the right one, and will replace the incorrect one. Still annoying)