If you look at the page source, you'll see this at the start of categories:
<li id="cat48" class="forumbit_nopost old L1">

So you could add #cat48 in front of the class. Example, instead of:
.subforums ol.subforumlist
You could put:
#cat48 .subforums ol.subforumlist

Really good stuff, as usual. Is there a way to increase the width between subforums? So that they aren't so stacked/crammed on top of one another?

http://awesomescreenshot.com/0a0qfy939

Just add some top-padding:

.subforumlist li.subforum {
padding-top: 5px;
}

Ok So, I Have set my ".childforum li.forumbit_post {" to 50%.... My 3rd category always looks ugly. Please See This -

https://vborg.vbsupport.ru/external/2012/01/32.png

How do i Center it?

I don't think you can center that without writing some code to do it (a plugin).

i like this but it confuses me lol

Is there a way to make this three columns?

Can you hep us out by posting where your code is and what you've used?

I just installed 4.1.12pl1 and this stopped working. I still get two columns, but the spacing differs from forum to forum with 3 different spacings. It is behaving like a tab stop overflow instead of just dividing the area into two pieces as it was last week with 4.1.10.

Did 4.1.12pl1 change the name of the class for subforum?

Here is what I have in additional css.

I'm not sure what you mean. I just tested that on my default 4.1.12 site and it looks the same on the forum.php page as on the forumdisplay.php page.