Here is a sampling of websites to get you started in mapping relationships between people & organizations:
Their tagline reads: Exploring the paths of power and influence". You can search by person's name or organization name. I like the brief bio as well as the great visual mapping feature of this free site.
CorporationWiki: Search by people, companies, and states. Find out who the movers and shakers are in a particular city.
LinkedIn: Find out just how many degrees you are separated from your prospects by typing their name into the search box and viewing their profile. LinkedIn spells out exactly who you need to work through in order to access your prospect. Search results are specific to YOU. The larger your network, the closer you'll be to your prospect. Also check out InMaps, an interactive visual representation of your professional universe.
NodeXL: Designed by a team of programmers from Microsoft Research, it is a plug-in to Excel 2007 as a free download zip file. It works with your own database and social networks. Click here to learn how Jason Boley from Purdue University experimented with this tool in April 2010.
NNDB: The Notable Names Database tracks over 37,000 people of note. Their NNDB Mapper Tool allows you to visually see connections between people and organizations.
FEE-BASED Services ProspectVisual: Interacts with your own Customer Relationship Management (CRM) tool, Salesforce. (Nonprofits please note: You can have free access to Salesforce.com). They provide their "clients with comprehensive intelligence about their target opportunities, and delivers key insights about ways to reach them with trusted introductions". This product is from IntellectSpace and you may find their blog useful.
FoundationSearch: If you are already a subscriber to this research tool, you'll have access to their Director Connections tool. Very useful feature!
WealthEngine: Subscribers to Wealthengine will see the "Circle of Friends" report highlighting other people your prospect is connected to, both in the corprorate world and the nonprofit world.