I saw this, and couldn't resist, so I made my own Google Code search:
<?php
if(!isset($_GET['do'])){
$lang = Array(
"actionscript",
"asp",
"assembly",
"C",
"C++",
"C#",
"css",
"html",
"java",
"javascript",
"perl",
"python",
"ruby"
);
$disp = Array(
"Action Script",
"ASP",
"Assembly",
"C",
"C++",
"C#",
"CSS",
"HTML",
"Java",
"Java Script",
"Perl",
"Python",
"Ruby"
);
echo ('<form action="?do=search" method="post">
<input type="text" name="key" value="Keywords" onfocus="this.value=\'\'" /><br />
<select name="lang"><option selected="selected" value="null">Language (Keep here to not be language-specific)</option>
');
for($i=0;$i<count($lang);$i++){
echo '<option value="'.$lang[$i].'">'.$disp[$i].'</option>';
}
echo '</select><br /><input type="submit" value="Search" /></form>';
}else{
if($_POST['lang']!='null')
$lang='lang:'.$_POST['lang'];
else
$lang='';
$key=strtolower(str_replace(' ','+',$key));
header('Location:http://www.google.com/codesearch?hl=en&lr=&q='.$key.'+'.$lang);
}
?>