What font is this ?

Proxima Nova  Vorgeschlagen von SashiX 

and? another Dribbble font?

Yes it's on Dribbble.

Here's the link: http://dribbble.com/shots/1089229-Scaligent-Contact-page-and-form/attachments/135976

most probably it's Proxima Nova, because other things are written with this one

Is it Regular or Semibold or Bold ?