I start noticing that some Google results are links to some Google redirect engine. But almost all the others are direct links.
Are they starting to count the clicks to better rank your site?
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They do this if you are logged into your Google account to keep track of your search history (which you can later search or review).
They also have done this in the past to see how their search results are being used.
They do not use it for ranking sites. It can be manipulated way too easily for that.
The links start out pointing directly to the actual result. When you click on the link, an
onmousedown event handler changes it to the redirect link. If you click a link and drag the mouse off of it (so you don't actually follow the link), you will start seeing the redirect link in the status bar for that link.