Youtube video size in grid theme I am trying Omega and wondering if there is a way to specify the size of the Youtube video in grid terms, so I could easily show few videos next to each other (in a view for example).

Or if there is a way to make video automatically fit within a cell of a view?
Setting the video's width to 100% via CSS should make it fit whatever width you've given its wrapping cell or div. 

Check out the FitVids module / library for an all round solution to making videos behave better on responsive sites.

http://drupal.org/project/fitvids

http://fitvidsjs.com