This plugin integrates Google Website Optimizer with WordPress.
You can then make a link click count as a conversion. It is the green upside down arrow (funnel) in the texteditor menu. Just make sure you check "Page uses link click as conversion(goal)". Otherwise no conversion will occur.
No. It works for me but can't make such claims. So it is good if you let me know if it doesnt work for you so I can take a look at it and update the plugin if need be =).