Business web directories are a great source of data and scraping data from them is a common request from clients. Below are my list of directories that I know of from each country or region. I have noticed that directories for poorer countries often disappear, so let me know if a link no longer works.

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Location Business directories
Africa http://www.yellowpagesofafrica.com
Argentina http://www.paginasamarillas.com.ar
Australia http://www.hotfrog.com.au
http://www.yellowpages.com.au
Belgium http://www.pagesdor.be
Belarus http://www.b2b.by
Bolivia http://www.boliviaweb.com/business.htm
Brazil http://www.brazilbiz.com.br
http://www.telelistas.net
http://www.guiamais.com.br
Canada http://www.yellowpages.ca
http://www.ziplocal.ca
Chile http://www.chilnet.cl
http://www.amarillas.cl
China http://www.yellowpage.com.cn
Columbia http://www.quehubo.com/colombia/
Cyprus http://www.cyprusyellowpages.com
Czech Republic http://www.zlatestranky.cz
Denmark http://www.degulesider.dk
http://www.kob.dk
Estonia http://www.ee.ee
Europe http://www.europages.net/a></td> </tr>
Finland http://www.keltaisetsivut.fi
http://www.yritystele.fi
France http://www.pagesjaunes.fr
Germany http://www.businessdeutschland.de
http://www.klicktel.de (same site as http://www.11880.com)
http://www.yellow.de (same site as http://www.gelbeseiten.de)
Greece http://www.xo.gr
Hungary http://www.yellowpages.hu
Iceland http://www.gulalinan.is
India http://www.indiacom.com
Indonesia http://www.yellowpages.co.id
Ireland http://www.yourlocal.ie
http://www.goldenpages.ie
Israel http://www.d.co.il
Italy http://www.paginegialle.it
Japan http://itp.ne.jp
Latin America http://www.paginasamarillas.com
http://directory.centramerica.com
Lebanon http://www.pagesjaunes.com.lb
Lithuania http://www.visalietuva.lt
Malaysia http://www.yellowpages.com.my
Mexico http://seccionamarilla.com.mx
http://www.directory.com.mx
http://www.yellow.com.mx
Middle East http://www.ameinfo.com
Myanmar http://www.myanmaryellowpages.biz
Nepal http://www.nepalhomepage.com/yellowpages/
Netherlands http://www.detelefoongids.nl
New Zealand http://yellow.co.nz
Norway http://www.gulesider.no
Peru http://www.denperu.com.pe/denexe/busqueda.asp
Philippines http://www.eyp.ph
Poland http://www.pkt.pl
Portugal http://www.pai.pt
http://www.guianet.pt
Romania http://www.paginiaurii.ro
Russia http://www.sakh.com
Singapore http://www.yellowpages.com.sg
Spain http://www.paginas-amarillas.es
http://es.qdq.com
Sweden http://gulasidorna.eniro.se
Switzerland http://www.local.ch (same site as http://www.pages-jaunes.ch)
http://www.branchenbuch.ch
Turkey http://www.turkindex.com
Ukraine http://www.ukrainet.com.ua
http://www.mercury.odessa.ua
United Kingdom http://yell.com
http://www.192.com
http://www.scoot.co.uk
United States http://www.yellowpages.com
http://www.superpages.com
http://www.allpages.com
Venezuela http://www.pac.com.ve
Vietnam http://www.vietnamonline.com/yp.html
World http://maps.google.com
http://www.infobel.com