The default styles for form input elements are pretty ugly (at least on Mac OSX).
Those styles are commented out in screen.css (see below). If the default blueprint styles 
are desired, you can uncomment them....

These are the styles that have been commented out in screen.css.
/*
input[type=text], input[type=password], input.text, input.title, textarea {background-color:#fff;border:1px solid #bbb;}
input[type=text]:focus, input[type=password]:focus, input.text:focus, input.title:focus, textarea:focus {border-color:#666;}
select {background-color:#fff;border-width:1px;border-style:solid;}
input[type=text], input[type=password], input.text, input.title, textarea, select {margin:0.5em 0;}
input.text, input.title {width:300px;padding:5px;}
input.title {font-size:1.5em;}
textarea {width:390px;height:250px;padding:5px;}
*/

