Here you can test if a site is listed in any of the available black lists:

http://www.robtex.com/dns/DOMAINNAME.html
http://www.robtex.com/ip/IPADDRESS.html
http://hosts-file.net/?s=DOMAINNAME
https://www.trustedsource.org/en/feedback/url
http://www.siteadvisor.com/sites/DOMAINNAME

http://www.trustedsource.org/TS?do=feedback&subdo=query&q=DOMAINNAME

http://www.malwaredomainlist.com/mdl.php?search=DOMAINNAME&colsearch=All&quantity=50
http://www.google.com/safebrowsing/diagnostic?site=http://WEBSITEURL

http://www.mywot.com/en/scorecard/DOMAINNAME

Documentation Consolidation (Docs) Download Center
On-line version
OpenSolaris documentation community

"Easy for bots, difficult for humans". Not that it was the idea behind Completely Automated Public Turing tests to tell Computers and Humans Apart. The proper test should:

1. work properly out of the box
2. work regardless of language settings
3. be solvable for almost all humans
4. and few Bots

But what about the implementations? Read about CAPTCHA's here.

http://foto.ograf.ru/2008/07/07/339

http://caiiika.livejournal.com/315968.html

http://www.diyaudio.com
http://www.diycable.com
http://diyaudioprojects.com
http://www.takefiveaudio.com
http://www.vhaudio.com
http://www.uoguelph.ca/~antoon/circ/circuits.htm
http://www.vhaudio.com
http://www.bmm-electronics.com
http://www.partsexpress.com
http://www.heatshrink.com
http://www.jensencapacitors.com
http://www.passdiy.com
http://www.ezdiyaudio.com

NL:

http://www.ae-europe.nl
http://www.audiofreaks.nl
http://www.deaudiofabriek.nl
http://www.platenspeler.com
http://www.hifisupply.nl
http://www.n-joymusic.nl
http://www.zelfbouwaudio.nl
http://www.tweaks4u.com
http://www.speakerenco.nl

DE:

http://www.hifi-tuning.com
http://www.hifi-zubehoer.info
http://www.dienadel.de
http://www.conrad.de
http://www.schuricht.de