Sorry to hear that Mark. In being the one that implemented this change, and the preliminary project to migrate the old articles over to the Cisco.com publishing standards, I'll be happy to take the feedback. This was noted to occur previous to now:
https://supportforums.cisco.com/blog/12176911/updated-access-customer-knowledge-base
I am already aware of some users unhappiness w/ the search aspects of the TechNotes.
Previously - the search mechanism was the same, albeit that was limited to the knowledge base articles per our previous board's engine. Currently - we have to adhere to Cisco's publishing standards in writing and presenting our knowledge base articles - and that was one of the primary drivers for the change. I hope that you'll find the articles at least a little more clean and uniform in presentation. If not - you can submit feedback directly on the articles, and we take the results of what people find useful/not useful very seriously, and appreciate the feedback.
From within the advanced search - you can use the "ESA" tag when searching, it will limit results presented from Cisco.com. It will return result directly relating to the Email Security Appliance:
http://tools.cisco.com/search/results/en/us/get/advsrch?q=ESA
Happy to help or address concerns that you have - just reach out to me and let me know - robsherw@cisco.com.
-Robert