A busy time at Amazon.
First, as noted here and here:
http://blogoscoped.com/forum/69845.html
and
http://www.resourceshelf.com/2006/10/01/search-briefs-a9-discontinues-many-features-yahoo-to-open-yahoo-mail-api/
changes at A9.

But that's not all. While Amazon's Web Services are getting lots of attention, Alexa.com (another Amazon.com company (search and rankings) also offers a web search platform.
http://websearch.alexa.com/
Here's Philipp's intro post from 13/12/2005.

In this new post"
http://www.resourceshelf.com/2006/09/30/alexas-web-search-platform-releases-three-verticals-to-showcase-platform/

we report on some recently highlighted vertical search demos from the Alexa team using the AWSP technology

+ robots.txt Search
http://www.alexa.com/site/devcorner/rdt
Search by user agent name.

How it was built:
http://www.alexa.com/site/devcorner?page=rdt

For example: here's a search for the Google Media Partners bot
http://www.alexa.com/site/devcorner/rdt?results=y&crawler=Mediapartners-Google
and for the Googlebot-Image bot
http://www.alexa.com/site/devcorner/rdt?results=y&crawler=Googlebot-Image
Results also available in XML.

Neat tool, interesting and even a bit fun. I wish you could do more with it.

+ Camera Image Search
http://www.alexa.com/site/devcorner/cis
How it was built.
http://www.alexa.com/site/devcorner/samples?page=cis
Limit using many criteria like:
Camera
Focal Length
Image Height and Width

+ ZIP File Search
http://www.alexa.com/site/devcorner/zip
Search by file name, file date, file name.
How it was built.
http://www.alexa.com/site/devcorner/samples?page=zip

Remember, these are all demos.

I mentioned this 10 days ago, asking whether they'll migrate http://a9.com to use this platform too...

http://blogoscoped.com/forum/68624.html#id68624