We build stuff inhouse.
Kerb are a team of specialists. There are 15 of us and each developer is an expert in his field. We've built online content for plenty of famous brands - and over 60 seperate pieces of content for the BBC alone.
Our database department develop complicated online applications written in asp, php or jsp. Our action script guys build Flash games using proper games physics and test applications for macromedia with whom we have a long standing relationship. Our designers are well versed in the technicalities of SEO and brand bibles, as well as being responsible for the bizarre looking nonsense we dish out. And the animators come in both 2D and 3D flavours.