Justine - are you following the Barnet corporate blue used in all the signposts ? LOL
I think maybe a pixel spacing at the top to space the banner ads down a tad. Also consider rounding off the top left and top right 'mumsnet' / 'parents' corners with a rounded edge instead of 90 degrees. Looks a bit harsh.
And I've just seen you've put the fainting fathers on featured threads when you know full well it's got me in all my glory post floor-inspection.
Also I'd vertically centre the DSC logo next to 'Hosting by'
I am a picky little git.