1) no obvious link back to the 2.0 section.
2) the dmlogo.gif image that links to www.digitalmars.com is missing (presumably it should be ../dmlogo.gif.
3) I'd highly suggest moving the 2.0 parts under a 2.0 directory and having both D 1.0 and D 2.0 on the left nav block all the time and some how making it very very obvious, probably in the header across the top which of the two sections you're in.
Made major priority since newbies will be affected more than experienced people and that's not good.