Good Links

http://pagerankplus.net/CheckBacklinks.aspx?d=yahoo.com&#form&t=0.11717560361053969

http://www.codeproject.com/KB/aspnet/Google_Pagerank.aspx

ebay http://developer.ebay.com/community/featured_projects/?name=code+samples+project

Domain age http://www.webconfs.com/age-of-domain-and-serps-article-6.php

http://www.webconfs.com/domain-age.php

http://sourceforge.net/projects/whoiswin/

http://www.webtropy.com/articles/whois.asp?Whois
http://www.mentalis.org/soft/class.qpx?id=10

http://www.aspheute.com/english/20000825.asp

http://www.programsdb.com/scriptscategory/2/2/1/0.html
http://www.google.com/support/webmasters/?hl=en
http://www.who.is/whois-com/ip-address/csharpworld.com/