I like it -- I think it makes perfect sense to put the poster info on the right.
BUT, I think there is just a bit TOO much going on ... Everything feels quite cluttered and claustrophobic. Too many boxes... particularly viewforum.php. It's all a bit bewildering. I genuinely feel THIRSTY for whitespace.
Some specific comments, from top to bottom for viewforum.php:
Breadcrumb trail: the carats are backwards.... Doesn't make sense
icon bar: love it, love the new icons!
Forum title: redundant with the breadcrumb trail above. Need to simplify; too much going on.
forum rules: too prominent, and Yet Another Box before the content has even started. And a conflicting colour, at that. Why not float right at the same level as title, or, even better: remove title and float to the right of the breadcrumb trail?
Subforums w/grey border: fine, although it just looks cluttered to me. Tiny all-caps headers just add to the clutter... suggest making them bigger. Also, everyting else is pastel pink - blue... where did the darkness come from?
Newtopic* button: doesn't really fit with the style. I see it is supposed to fit with the red element running through the site, but it isn't fleshed out properly... the "New" and "topic" need to be in more contrasting colours... they are two words. Also, what's with the asterisk? Is there supposed to be an asterisk reference somewhere? If not, kill it, for goodness' sake... the style has elements in spades, it doesn't need more.
Search topic: Good idea and I see what you are trying to achieve with it here: getting users to search before posting. However, it's just One More Box, and One More Button to give users a headache -- would be much better off as a drop-down option in the header search IMO.
Whole bunch of clutter to the right: Suggest getting rid of the # of topics here -- it doesn't fit and it's already very busy with each page link in its own box. Why is "Page 1 of X" there? it's redundant. Just put "Pages: " followed by the pretty boxes.
Topic Listing: Fine, although I have the same comments on the grey borders/small heading fonts. The "View Latest posts" icon has a downward pointing arrow: That means "Download" to most people: suggest you fix. Not loving he folder icon animation: Perhaps if the page were less cluttered, it could be pulled off, but as it is, it is Just Another Thing Going On on an already overcrowded page.
Bottom of the page: OH MY GOD, WHAT A RELIEF!! SOME WHITE SPACE!!!!! (nervous breakdown averted). Finally, some much-needed white space/clarity. I WISH the top of the page was mor like this.
In short: simplify, pare down, combine where possible....
The posting page (posting.php) is a great example of how it should be... simple, easier onthe eyes. THAT looks like the vision of the future... simple, semantic, uncluttered.