A moderator at WebmasterWorld noticed Google stopped using standard URL redirects in the Google search results to track click events. If you hover over the link, it now appears that Google is just sending you directly to the destination URL, without using any click tracking.
Here is a sample of the code used:
<a href="http://www.google.com/" class=l onmousedown="return rwt(this,'','','res','4', 'AFQjCNG5-9Jej-ukVeakTgwonqt2narbYg','&sig2=4Lwo00y104At7P9SCT7uXA')">
This appears to be a new way of Google tracking click events in the search results.
Forum discussion at WebmasterWorld.