First of all this is not hacking domain name and change DNS record. This is more fun than that. Domain Hacks is about getting the word you want as a combination of Top Level Domains and couple of letters.
Examples for domain hacks
blo.gs
chronolo.gy
tel.ly
del.icio.us
cr.yp.to
These domain hacks make your domain extreamly shorter and make it easy to remember. It is a pretty good solution as all the dictonary word domain names are already taken. You can user Domain hack search utility to get ideas suggestion to creat above type of domain hacks.
