Dex Online Another yellow and white pages directory. Lets you look up by business catagories too.
thelist.com Looking for someone in a particular city? This list shows just about every internet provider in any given city, lets you list by areas or search for specific servers. Great for figuring out what ISP your target is on.
InfoSpace Search Standard lookups of businesses and residences. Also does reverse lookups on phone numbers.
Genealogy and Ancestry Resources:
familytreemaker.com The largest and most complete genealogy resource. This is software that helps you search for your ancestors.