Fortunately, I was right: The iPhone troubleshooting section of Apple's main iPhone support site contains a walkthrough for situations like this, complete with instructions on how to restart the phone, force quit a frozen app or reset the phone in cases like mine where it has completely locked up. Here are these steps in a nutshell:
Restart your iPhone: Most people probably already know how to do this, but just in case, you can simply hold the sleep/wake button on the top for a few seconds to bring up a red slider at the top of the display which allows you to power off the phone.
Quit a frozen iPhone app: I know it's a crazy thought, but it is entirely possible that Apple's wondrous iPhone apps can lock up from time to time. In this case, simply hold the Home button when in the app for about 6 seconds to kill the app. You should be able to jump back into the app without restarting the phone itself.
Reset your iPhone: Note that this is not Restoring your iPhone; that's the button in iTunes that wipes the iPhone and all your information on it. Resetting an iPhone is nothing more than a hard reset or a forced reboot – you're simply cutting the power and making it reboot. To do this, hold the sleep/wake button and Home buttons simultaneously for a few seconds; the display will quickly wipe itself and you should see the black background and white Apple logo, signifying a reset well done.
Fortunately, that reset fixed my problem and I'm jamming again with my iPhone as I write this. Still, you can be sure that I'll ping iTunes support to find out what's going on with these files, as this is the third one I've downloaded from the iTS that's caused an iPod to stop dead in its tracks. Anyone else experience something like this? You know where to sound off.
The SideKick 4G Phone Protector Case protects the body of your phone while providing unobstructed access to your phone. The two-piece protector case snaps securely onto the front and back of your SideKick 4G. Specifically made for the SideKick 4G, the SideKick 4G case is lightweight and durable. With the SideKick 4G Phone Protector Case, you will be able to function your device and keep it safe with maximum protection.
Various designs to fit the style of your phone
Protect your phone from scratches to preserve your phone’s look
Cases and Covers for the Nook Color – Coming Soon! ~ We are expanding to eReaders and Tablets.
Barnes & Noble Nook Color accessories are carried at GyverGear. Barnes & Noble Nook Color accessories include the Barnes & Noble Nook Color car charger, Barnes & Noble Nook Color leather case, Barnes & Noble Nook Color S ear piece, Barnes & Noble Nook Color head-sets, Barnes & Noble Nook Color home chargers, Barnes & Noble Nook Color belt clips, Barnes & Noble Nook Color data cable, Barnes & Noble Nook Color travel chargers, Barnes & Noble Nook Color batteries, Barnes & Noble Nook Color phone covers, Barnes & Noble Nook Color face plates, and many different other Barnes & Noble Nook Color accessories that are part of our Barnes & Noble Nook Color accessory product line.
http://www.gyvergear.com/brands/nook/color/index.html