I've found some code that's working to make a dropdown jump menu for the monthly archives, but can't seem to get it to work for categories. Here's what I'm using:
<?php echo "<select name='archive-dropdown3' onChange='document.location.href=this.options[this.selectedIndex].value;'> <option value=''>"; echo attribute_escape(__('Browse by Month')); echo "</option>"; wp_get_archives('type=monthly&format=option&show_post_count=1'); echo "</select>"; ?>
I've tried wp_list_categories, and the_category, but can't get either to work with the above code. Any ideas?