We have covered the visible Google Tracking Clicks in the past. But a DigitalPoint forum thread shows how Google is also tracking your clicks, even if it doesn't look like that from the URL. Shawn Hogan explains that Google is using an "onmousedown event for each link that calls a JavaScript function that reports the link clicked behind the scenes." He shows the code Google is using in his post.
Forum discussion at DigitalPoint Forums.