My summer of code project is a plugin named codeWord, it implements
CodePress into the WP theme code editor, but with a few additional
features and fixes.
 1. It now uses some simple jquery ajax code for saving, which avoids
having to reload the whole page.
 2. If you attempt to navigate away, but haven't saved your recent
changes it shows a prompt.
 3. It has an dropdown input that auto-completes WP functions.
 4. Plus a few little fixes here and there, notably I fixed the tab
key to insert a tab character.

I still have a fair bit of work left to do getting everything running
smoothly, but I'd appreciate any feedback on my work so far.

In my remaining time I hope to develop the function lookup, adding in
default parameters for each function and linking them through to the
relevant page on the codex.

If you'd like to take a look round the plugin, then checkout my code
from the WPSoC repository[1] and if you'd like to keep up to speed
with my progress then grab a feed from my blog[2].

Problem 1: A stylesheet link in the footer? Does not validate. Move it
to the header section.
Problem 2: Why are you not using wp_enqueue_script? Looks like you
made an abortive attempt at that? Try this sort of thing:

function codeWord_scripts() {
        wp_enqueue_script('jquery-form'); // already defined by wordpress
        wp_enqueue_script('jquery-bgiframe',
'/wp-content/plugins/codeword/autocomplete/jquery.bgiframe.min.js',
array('jquery'), '2.1.1' );
        wp_enqueue_script('jquery-autocomplete',
'/wp-content/plugins/codeword/autocomplete/jquery.autocomplete.js',
array('jquery'), '1.0.2' );
        wp_enqueue_script('localdata',
'/wp-content/plugins/codeword/autocomplete/localdata',
array('jquery'), '1.0' );
        wp_enqueue_styles('jquery-autocomplete',
'/wp-content/plugins/codeword/autocomplete/jquery.autocomplete.css',
array(), '1.0.2' );

function codeWord_footer() {    
        global $codeWord_abs_dir;
        // the codeWord_url variable must be set incase WordPress is not
installed in the base url.
        printf('<script type="text/javascript">var codeWord_url =
\'%s\';</script>', get_bloginfo('wpurl'));
        // add main js file to determine the current filetype and browser and
serve the according codePress engine.
        printf('<script type="text/javascript"
src="%s/codeword.js"></script>', $codeWord_abs_dir);

That manual definition of the plugin directory/URL in codeword.php is
not needed. There's a constant of WP_PLUGIN_URL that holds the URL to
the plugins, so WP_PLUGIN_URL . 'codeword' would be good enough to
give you the URL you need.

The function search box has a few issues. When I tried to type "the_",
then it has trouble when I hit the shift key to type the underscore.

The Indent Guides button doesn't seem to do anything. Maybe I'm missing it?

- Chris Jean