Domain Name Software
Domain Names are the names that are used to identify web sites, and for groups of email addresses. Popular domain name registration services like http://www.register.com or http://www.godaddy.com easily come to mind.
The domain ending with .com is easy to remember, as they are the most common name but not necessary the best. In the beginning, generic domain names were available in .com, .edu, .gov, .int, .mil, .net, and .org extensions, out of which .com, .net, and .org were used for registration without restriction. Originally it intended for the noncommercial organizations and other organizations which are not using .com or .net extensions.
A lot of gTLDs are available worldwide, however the .mil for military and the .gov for governmental could only be used by the respective authorities.
Unless your network marketing opportunity is based in a single country or region, it is pretty safe to exclude the use of any country specific TLDs. If Colombia can pull the plug on people from other countries using their ccTLD, so can other countries.
Potential names suited to the need of the hour, like obamastaxpolicy.com, obamapolicies.mobi, dot us, dot biz, jobhunts.org, jobhunt.us, jobhunts.mobi, jobhunts.info, and the like are available. Additionally, there is a whole cast of new domain name endings that should be avoided.
Suggestion tools are software tools that search for available domains based on combinations of keywords, etc., and then help you register them.