This isn't a redirect virus, I've gotten consistent results with it (actually, the link randomises the appearance, but it has the same URL), and all other search engines and the rest of Google's results work fine.
Type "shockwave flash player" into Google and "Free Flash Player" will come up as a sponsored result. I don't know for how long, I've (finally) managed to send a ticket off to get it removed. Their Contact sites are useless.
It appears to be a trojan. Or several. I don't know, Vet is picking off incoming viruses once every ten seconds. Spybot found about fifteen viruses on it's first run, and is on one result at halfway through it's second.
The site offers a Flash Player download, filename is something like flashplayer.exe but installs "sexvids". I knew something was up when it finalised installation
then asked where I wanted to save it. Now, I have trojans. Yay.
Google says the site is www.22sew.cn but that links to, well, click it. File not found. The actual "Free Flash Player" link takes you to https://51f.22trust.cn/ where the virus is found in a big download button.