For their part, child protection advocates back technology that makes this information more accessible to the public.
Stacie Rumenap, president of Stop Child Predators, acknowledged that that "there's always going to be some room for error" when it comes to technology that is aggregating information related to the hundreds of thousands of sex offenders.
But she applauded the ThinAir for offering technology that helps keep children safe.
"We would caution parents to make sure that they would know their neighbors and look at the information and read it like they would read any information," she said. But, ultimately, said about the company behind the app, "we commend them."
Here's a small sampling:
Smoking marijuana is known to have an adverse effect on memory and concentration, but now, thanks to a new iPhone application, even the foggiest of users should be able to locate their connection -- make that medicinal marijuana provider -- with relative ease.
Launched by AJNAG (Activists Justifying the Natural Agriculture of Ganja), a Web-based community advocating for medical marijuana, the Cannabis app takes those seeking medicinal marijuana through the entire process of obtaining it. The app is downloadable from Apple's store for $2.99.
"Our goal is to put the power of cannabis change in your pocket while you enjoy the most sticky and potent iPhone application available!" the founders say in a statement on their Web site.
Here's how it works. The application displays an interactive map dotted with doctors who can prescribe medicinal marijuana treatment for their patients.
It also shows -- after, presumably, users have procured prescriptions -- the medicinal marijuana suppliers within the users' vicinity. And, what's more, the application includes a database of lawyers who specialize in marijuana-related cases, in should users encounter skeptical local authorities.
To help with grassroots media campaigning, the developers also say they will donate 50 cents for every "Cannabis" purchase to a non-profit reform fund, which they say will be set up once the application reaches 1,000 subscriptions.
Just remember -- Cannabis only works in states where marijuana has been legalized, so if you've scored tickets to a Grateful Dead show in, say, Alabama, don't expect Cannabis to help you score anything else.
In a move sure to thrill its laziest customers, Pizza Hut unveiled recently its new iPhone application that allows users to order pizza without so much as dialing a number. Simply type in your order, then sit back and wait until it arrives.
For those bored with the traditional methods of ordering pizza, the app also has some unconventional tools. If you want extra sauce on your wings, for instance, you shake the phone like a bottle.
And, for those who find ordering pizza too sober a task, the app comes with a racing game named "Hut Racer."
Pizza Hut hopes the app will appeal to customers who rely on their iPhones, said Brian Niccol, Pizza Hut's chief marketing officer.