This is an old revision of the document!
OK, so you don't have much time?
here is the gist of it :
use the firefox-add-on: https://addons.mozilla.org/en-US/firefox/addon/b-dns/
visit the search engine: http://grep.geek/
use the openNIC proxy: http://proxy.opennic.org/
need a faster wiki than this? use the fossil wiki: t.b.a.
which TLD has the most domains? http://report.opennic.org/ see TLD info from menu