WP Likes lets your blog visitors 'like' your posts on the go.
Yes! it shows top liked and commented upon posts in your sidebar.
Yes, for now.I will remove this dependency in future. jQuery if being already called on page is reused, otherwise its fetched from Google AJAX APIs.
Not right now.
Create a new page with shortcode like- [wp_likes] [wp_likes show="monthly"] [wp_likes show="weekly" count="10"]
Please drop a mail to me[at]aakash[dot]me with blog link.