For users with a wide monitor, running their browser in full-screen mode, the left column (Thread / Thread Starter) of the list is rather far from the right columns (Last Post, Replies, Views). So, it would be useful to slightly mark the "current" row (thread) with a/the background color by the :hover CSS selector.
The second little suggestion is to add tooltips to all icons like
on the left, for newbies.
The second little suggestion is to add tooltips to all icons like