Apple’s iPhones have doubled their penetration rate versus a year ago, according to Nielsen’s most recent Home Technology Report.  iPhone penetration hit 5.9 percent in Q3 2008, up from 3 percent in Q3 2007.

In addition to the increased popularity of the iPhone, Nielsen found that DVRs such as Tivo are showing up in more homes, with penetration up over 50% versus a year ago.  Households with teens were over 30 percent more likely than the average household to own or rent a DVR device.

Download the full report here.

Nielsen’s Q3 2008 Home Technology report measures quarterly survey data on American technology usage and attitudes.  A Nielsen PreView study based on this HTR focused on adoption rates on over 50 current technology devices and technology subscriptions.