Nexxoz

View the plugin page for more information and discussion: <a href="http://nexxoz.com/" rel="nofollow ugc">http://nexxoz.com/</a>
WP xLogo Changer isa simple plugin to change the logo for wp-login page.

WP xLogo Changer

binarymoon

Bartosz Gadomski

Teydea Studio

A simple way to customise the login screen on your WordPress install. There are a number of advantages to using this plugin:
<ol>
<li>Using a plugin means the changes stay when you upgrade</li>
<li>It’s an easy way to add a little polish to your freelance web design jobs</li>
</ol>

Custom Login

Not too much, not to little, just right.  Allows for custom logo, font and button, and a little extra CSS if needed.  Based on the size of your logo you will need to adjust the background position and/or margins of the #login but with a few tweaks it looks great.  

goldilocks

Customise the WordPress login box quickly and easily

WP xLogo Changer vs Custom Login