New to Typophile? Accounts are free, and easy to set up.
I admire the typography used by Tate Gallery, London. They use it for signage inside the museums, on the web, and other places. It kind of resembles VAG and Helvetica Rounded. Maybe it's a custom face made by Wolf Olins, who created the identity for Tate Gallery. Can anyone clarify?
You can have a close (but brief) look at it by typing
... and the click on "Explore Tate Britain".