Simple plugin used for a complex purpose: ReTweet custom links on specific blog pages/posts.
This plugin gives you the ability to add in custom URLs via the custom field feature in WordPress. If you'd like to track a campaign using Google Analytic's Campaign Tracking feature, this gives you the ability to add the necessary query to the end of the URL. You can then use a URL shortening service (TinyURL.com) so that the link is an appropriate size for micro-blogging. No other Twitter ReTweet plugin gives you this ability since all of the URLs are automatically generated.