On my own website I am using 'Simple Twitter Connect' now with the Tweet Button functionality.
As I would like to use bit.ly as shortening service I installed the WP Bit.ly plugin so the core short url functionality will retrieve the bit.ly shortened URL. This works great, but when clicking the Tweet Button in e.g. this post the following is shown: http://tweetphoto.com/39223525
Looking into the source of the website, I see that the data-url is supplied correct:
<a href="http://twitter.com/share" onclick="javascript:_gaq.push(['_trackEvent','outbound-article','twitter.com']);" class='twitter-share-button' data-text='Customizing WordPress theme Mystique' data-url='http://bit.ly/cie7mS' data-counturl='http://rubenwoudsma.nl/customizing-wordpress-theme-mystique/' data-count='vertical' data-via='rubenwoudsma'>Tweet</a>
Does anyone know if this is a bug or a feature of Twitter.com? And how about the count then? What will Twitter count? The data-counturl? But that is behind two shortening services.
Hopefully someone can clear this out?