Try cleaning your browser cache and Flash local storage - most likely you've been browsing a lot of anti-sopa content (not completely unrelated ;) - http://imgs.xkcd.com/comics/geoip.png )
The best anti-sopa ad I've seen this morning (12h ago) when following a link to Forbes and there was an overlay ad covering the whole browser window in dark gray (marked as Advertisement in the title but no further text, only gray) - either Forbes did this themselves or somebody is spending some money to get the message around to Average Joe.
What's also intriguing about aw3c2's message is how his/her question clearly demonstrates how our brains have trained themselves to ignore banner ads.
I read TC every day and it took me a little bit before I realized that the huge banner ad at the top and the one on the right were a) there and b) anti-SOPA.
Cheers! I am actually a non-javascript plus adblocking person. That website is really LOUD and obnoxious with so much contrast and huge text, I have no idea what is content, what is not, what is important, what is RANDOM BIG WORDS.
Title should be changed to Adsense since it's only properties on the Google Display network.
Also, a very possible explanation could be that they're only showing those ads by targeting pages that show SOPA content. The display network is HUGE and it would be a big ticket purchase for Google to buy-out the entire network themselves (they still have to pay the sites). Are there any examples of this showing up on non-tech, non-sopa related sites? If so, please include them. If not, you're probably just seeing Google buy targeted ads around a subject (SOPA) and paying for them on their own network. Not unheard of, as they've done similar things with Chrome, etc
I dont see the same ads on TechCrunch in India. My guess is Google is running an Adwords campaign in US to make people sign the petition. I have seen them run campaigns for chrome, gmail etc. before.
Click on any article on TechCrunch, and you'll see that they're not showing the anti-SOPA ads against actual content pages.
I'm guessing that they're only doing this at the top level pages of these sites; possibly paying the sites for the space themselves.