If you are looking for high PR dofollow classified websites, here is a complete working list which will help you improve the page rank of your website and also give you some target customers, the best classified website is craigslist followed by olx and ebay.
http://web-free-ads.com/609/posts/22-Miscellaneous/221-Everything-Else/228848-Mobile-Apps-Development-Services-by-TechAhead-Software.html
http://www.freeclassifiedssites.com/10/posts/12-Services/57-Business-Services/714804-iPhone-and-Android-App-Development-Services-at-TechAhead-Software.html
http://www.traveluzion.com/usa/20072/posts/6/67/42699.html
http://www.aprovechate.com/?view=showad&adid=233006&cityid=177
http://www.sellandtellonline.com/140/posts/7-Services/143-Computer/12-Mobile-Application-Development-Services-TechAhead-Software.html
http://www.canetads.com/view/item-1673844-iPhone-Apps-Development-company.htmlhttp://www.listaboo.com/1/posts/6/90/461528.html
http://www.hot-web-ads.com/view/item-12403732-iPad-Apps-Development-company.html
http://globalclassified.net/536/posts/3-Services/24-IT/502207-iPad-apps-development-company.html
here is another high page rank business directory from US
www.unitedstatesbd.com/shop/bizlisting.cfm?action=viewListing&BIZL_ID=3416&BIZC_ID=8439
The website has a good interface and is listed in google index as well.
One should always emphasize on directories which are listed in google index, else you can consider them as deindexed.
