Currently in HEAD there is the standardold theme that needs to be split into two parts.

The first base that contains CSS information that is required for functionality or core layout but does not contain any set style or frilly bits, and then the second half (the style + frilly bits) need to be split into a new theme that will look like standard white.

At the same time plugin CSS can be moved back into the plugins and a general tidyup of the whole CSS can happen..... as much as time permits anyway.