I was just ready to make a blog post on Google moderator launched by Google some days back which is really a nice concept on voting for your favorite questions. Until I had a look at the trackbacks that Google approved on their Google Moderator Launch post. Even though all the trackbacks are written on the page using a javascript function and does not carry an link juice or backlink benefits, but still a nice traffic resource for these traffic sites.
Here is a screenshot of the spammy trackbacks on the page I am talking about.

We all understand that trackback spam has evolved over the years with many BlackHat tools and scripts. But I think Google must have some kind of approval system to filter out of all these spammy trackbacks before they go live on their blog.
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Nice find, whats more surprising is that more than 10 links are from single domains which shows its all using a script
@Amit Bhawani - Yes Amit, It’s really easy !