Just to get things clear: your main gripe is with the links in the menus etc. ? I can see a point in that, as you stay on this site. Links in the posts, I'll keep those as open in a new window, the point is that they're always referrals to 'further info' and therefore the source of the link has to be visible as well (you likely will almost never want to get rid of the original post linking to the external URL).