Behance really is amazing. There's so many brilliant designers and artist's work available to perve over... Here's a little beaut' that's been featured on their main page. Encore Sans Pro. From the portfolio of Parachute.
"a fresh contemporart alternative to your overused classic sans"
I adore the feather light version; the sturdy trustful structure of good ol Helvetica, but with the inviting curves and playfulness of Avenir. We love it.
Buy it here.