The Getting Started and Systems Administration pages have a lot of content packed into a single page. This doesn't seem like the best way to organise things.
In particular there is still content on ZFS and Virtualization that could be migrated from the old Wiki. There are placeholders in the docs where this could go, but it would make the pages even longer.
It seems like the content could be split across a few more pages, so that storage and zones/virtualization could have their own pages.