List of Large sites using Postgres

I know this may be at least somewhat off the topic in this group, but I figured all of you would be better capable of
givinga good answer =) 

Our company is *finally* toying with the idea of chaning our DB's over to Postgres from Sybase. What they are asking me
isif there are any *large* sites using it. Anyone Anyone? By large, I am rather certain they are referring to such
thingsas lycos, yahoo, etc... I do believe the concern here is that we host a few sites that use a database backend,
andthose sites generate at least 20 million hits a month, and they dont want them to die if we were to change things... 

Any links or whatever would be GREATLY appreciated =)

Thanks


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