[Shelley_c]

Overall, it's a very nice style which looks clean and uncluttered. With regards to the logo I would remove the white surround on the text, enlarge it and instead of the white surround, implement a drop shadow at a low opacity using linear burn so the text looks prominant.

The Lastpost and collapse markers look okay though the arrrows inside look very crammed. Maybe opt for one arrow to give it some space.

Sub_forum images should be replaced for something custom, something custom which will look consistent with the style to highlight the area.

Same goes for the navbits_start.gif & navbits_final.gif image. Possibly replace this for something custom.

Apart from that everything looks spot on.