My biggest complaint would be that god awful "phpbb3" thats sitting right where the tip.it logo was. Changing that would might make the baby blue color scheme a little more bearable.
If your going to keep the blue/white thing as you theme like the old forums (which had many styles, but blue/white was defult), then maybe you could atleast darken the blue a little bit? The light blue is actualy making it hard to see becuase there is not enough contrast (it one step above cyan which would be nearly as bad as yellow on white). That and I dont like the color baby blue on principle.
Maybe you could add Code Black
which is really easy to see.
Also, Blue Moon
is fairly similar to the current style but with a darker blue.
The other thing is that all the old smilies look like there sqished for some reason. Except for the drooling one.
One other thing. Is there ANYTHING that can be done about the new quote box. Seriously, the person who designed that needs to re think the design. Aside from being pink, those quotation marks are really driving me nuts.