Website with nifty little apps
Including  
 
Block Checker which checks to see if a  
MSN/YAHOO Messenger user is Offline or Online.  
You can can check if u think that someone has blocked you and he/she is online.  
 
and  
 
 
* Advanced Anonymous Mailer  
* Website submission to Major Search Engines  
* Domain availability checker  
* Domain Whois  
* IP Whois  
* IP Address and IP Number Convertor  
* Webserver Scanner  
* Traceroute  
 
All are very easy to use with NO annoying crap.