The software used for the earlier version of Chemdex packed in totally after a server update and so the update planned for summer 2009, which is not finished, is here now. The bad news is most of the links are not yet in the system, but will appear slowly in the next few weeks. The good news is the links get checked automatically now and therefore the link fail rate of some 25% on the old system will be well under 5% or so and should stay at that level.
Keeping web site links up to date is a problem for any directory site, as you may have spotted on this and other chemistry directories. Hopefully the new system (the wonderful open-source Drupal) will do a lot of the updating, so benefiting all of us.
Searching for sites is improved vastly using the new "facetted search" system being built to the right. It allows you to refine searches based on key words in a comfortable sort of way. You can also search on words as well
For the moment I am not accepting link suggestions. A number of new features are planned. More soon.
It is very poor form to label web sites as "under construction", so for the moment Chemdex is a work in progress.