This is a really easy way to do it if you just want to track a few links.

From Google:

How do I manually track clicks on outbound links?: http://www.google.com/support/googleanalytics/bin/answer.py?...

I'm writing some Django middleware that auto-appends this exact thing onto all 'non-local' URLs. Keep on the lookout!

Also [url=http://damienkatz.net/2005/03/clicky_instantl_1.html] Damien Katz [/url] did a PoC (that works really well actually, albeit semi-dated) in 2005 of this concept.

That is exactly the kind of code that I was looking to write. The only difference is that it auto appends the code onto all URLs, local and non-local, then checks to see if they are non-local when they are clicked.

Mint (haveamint.com) has a pepper that tells you where your visitors are going.

That's good. I only wish that Google Analytics or other major analytics platforms incorporated the same feature. It would be relatively easy to include.