For a moment there it seemed www.chemrefer.com had disappeared. The url now links to chemspider.com. Turns out chemspider is doing a good job hiding chemrefer. The new (or temporary) link is this one
The nice thing about this search engine is that it only indexes from open access chemistry journals for example Pure Applied Chemistry or journals with open access content such as Chemical Communications. Remember that search engines like google index all journals but when you hit a promising link you will still get an access prohibited page unless you have a subscription.
Update: May 23. Now even this link throws a 404. Chemrefer is now officially M.I.A.