This is based on the survey we had on the site early this year (thanks to everyone who responded!). In the survey a lot of you told us that the navigation box we had as a webpart was hard to use and kept disappearing on some of the pages. We have changed that and went to tabbed navigation at the top of the page which should be much easier.
The wiki feature which a lot of you suggested is also live (although not integrated into the tabbed header yet).
We will keep improving the site in the future so if there’s any feedback and/or comments/suggestions – please bring them in!