Looks like Open Sans by Steve Matteson.

Better to tell the OP that font ID requests should be made in the Font ID forum, and not in Critique / Bitmap Text.

You are absolutely right, Theunis. Unfortunately my RSS-reader shows me not the right board, just all.

Renko, just checked that and you're right. I'm not sure how RSS feeds are supposed to work; would it be a technical challenge to add in which forum a post appeared?

... Quite ironically, the top RSS post I get on checking is ...

TYPE ID BOARD HAS MOVED! [7 AUG 2013]
Wednesday, August 07, 2013 23:28 PM

Please post your Font Identification requests to:
http://typophile.com/fontid.