i'd say go.com (pr9 - have you ever seen it promoted?)... it's owned by disney and is part of the primary domain for many of their sites like espn, etc.
ok seriously I think it could be QQ.com - it has 150,000 + US visitors per month and according to domaintools US accounts for 1,1% of it's traffic so... I gets around 15,000,000 monthly visitors. That should make it the most popular LL domain I think...
Technically you are correct, But the change fools noone, they still sell petroleum, and im sure they would have you believe it means "beyond poverty" if they could.
You only need to see how "green friendly" their website is to see through the smoke and mirrors. BP probably bought the domain under it's old name anyway. Unless some lucky sod sold it to them for a motza.