Letting users easily go through your application needs a login panel, which have to be very easy, clean. Todays PSD freebies is to achieve the same result.
Nothing more, under the hood, this panel has normal input fields, a field for user name, another for password. And if you forget the password, just in case, log in box contains a link where you can go & recover your password.
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Finally, if you find this can really help you, download it. I am giving you full layered psd.
Stay visiting. I am publishing more useful PSD resources sooner.