I think I might have figured out why there is so much space (and yes, it has to do with widescreen format, and also screen resolution).
I was looking at the Page Source, and noticed that the width for that column at each post is
18%. So when you resize the page, the relative width
will change (while the text and pictures stay the same size).
I also noticed that the content part of the post (the part with the member's actual text) does not have a size constraint on the column width.
That is also why, when a too-wide picture or extra-long text are posted and the data does not fit the window, the page gets a wider look (everything gets stretched out because of percentage).
I just wanted to ask the administrators if anything was changed recently, or if it was just me not paying attention before.
Thanks.
malu