There are several problems with the layout. Right sidebar is overlapping slightly; share/edit/delete/flag links are pushed to the side; and when I click on "add comment", the add comment link disappears, but the box to add a comment with does not show.

Running firefox 21.0; I think these problems might be specific to firefox.

Screenshot here:

Problem is not specific to the superuser.com site - see also these, and notice the right sidebar is overlapping the main content:

meta.superuser.com

stackoverflow.com