||is a simple web-interface to the popular dns command "host" - you are able to do a,ns,mx lookups and even axfr's !
||this is a classic, is has to be here - but there aren't many ping'able hosts left due to filters and firewalls.
||who can live without it, flirt with her - and she will reveal the path. it even does as-number lookups and a lot more.
||ever wondered who owns a particular ip, well "ipw" is your friend! - (you can at least find the providers abuse info).
||this is a simple interface to the whois command, you are able to query ripe, arin and nsi.