Fellow Macheads, I tried to install the new 4.2 software on my iPhone 3G and iPhone 4, but found myself only getting to about 1/2 to 2/3 on the iPhone's progress bar while on the Mac the progress bar was virtually at the end. I waited for hours, but nothing past this point.... Also, I had a heck of a time getting the iPhone to show that 4.2 was even available - it kept saying 4.1 is the latest software. I unplugged and plugged back in - spent virtually hours and hours on this project. Then I put both iPhones in DFU mode - no luck. I had exhausted every effort including checking to make sure I was on iTunes 10.1.... At the end of the day, do you know what was wrong??? I finally figured it out - I had WiFi Sync installed and it was somehow interfering with the update. Here's the uninstall link: http://getwifisync.com/mac/uninstall.zip I also had to do a full restart for this to work properly. Take this post with a warning - if you have WiFi Sync installed you MAY have the same exact problem as I have had... I fixed it by uninstalling Wifi Sync! Good Luck and Happy Updating!