.mobi is a new top level domain ending that signifies a site is viewable on your cell phone, pda, or psp. Rly.mobi is extremely simple, effecient, and free. You can take notes on the go, keep an address book, and best of all, if your phone is lost or stolen, you don't lose the information. Personally, I own a windows mobile device and perform a "master reset" around once a month to protect it from viruses. Using Rly.mobi's address book, I no longer lose my contacts. Great find!