I checked on google.com and google.co.uk, both with me logged in and logged out, and it was the second hit each time. Also using 'private browsing' to make sure no cookies were still trying to personalize the results. Still, different national flavors of Google will probably give slightly different results - more so if it's personalizing the search results for you.
I've just noticed when searching for "rationality" with Google, HP:MoR is the second hit. Wikipedia is top, which is both good and expected - but I was suprised to see HP:MoR so high up.
I think it's a good thing, anyone looking for info about rationality seems likly to be suprised by Harry Potter being mentioend, and then have a look at it.
The first mention of Less Wrong is on the second page of results, but I wouldn't expect "Less Wrong" to be as attention grabbing as "Harry Potter" when you've just searched for "rationality"