This link is the official CEN page. It provides a search function to find all standards related to a specific directive.
http://www.newapproach.org/ProductFamilies/Default.asp
(Note, this link has been updated as off 10th July 2003).
Here are some good websites for using Visual Basic and AutoCAD.
(...www.activedwg.com/vba.htm this link is now dead...)
www.cadprogrammers.net/
www.vbdesign.net/activecad/