I see freesound.org as the #1 for both engines.

I'm in Australia, but using the 'show all' results (not the 'only from Australia' option), and freesound.org is #11. #1 is wiki.creativecommons.org/Free_​Sound_​Effects_and_​Loops

With market set to Australia, the logo says 'bing Beta'. It says 'bing preview' for the US. I guess it's not fully baked for non-US markets. I wonder if the advertising campaign is restricted to the US?

I see freesound.org as #1 on Bing. I'll be honest, though, the first two pages of results on Bing look as good -- or better -- than Google's results.

I see 5 results from creativecommons.org as the top in bing, but thats as an Australian. When you switch it to US, its freesound. Even as US bing shows 3 results from dvguru that appear to be spam. It also shows 3 results from creativecommons, 2 of which appear to be somewhat un-useful, and the 1 other useful one appears on both google and bing.

I'd definitely call that search a win for google. There are far more useful sources of creative commons sound effects in google's first page.

freesound.org is the fourth result for me on Bing. I'm in California.

Seconded, fourth result. Seems that Bing's result pages aren't quite "static" (or "same") for all users.