Don't fret that the Klipsch Image S4s are a few years old -- they're still one of the best deals out there, and a perfect gift for anyone with a portable device. The S4i, which can also be had for less than $100, integrates an inline remote and built-in microphone for iPhone calls. For Android smartphone users, Klipsch also makes the S4a.
If your gift recipient has an iMac, they're certain to love the Apple Trackpad. The wireless trackpad adds iPad-like multitouch gesture controls to a Mac, and it's a perfect match for the Apple Bluetooth keyboard, too.
The MEElectronics Air-Fi AF32 Bluetooth wireless headphones sound great, have a stylish look, and sport a discreet built-in microphone, so they double as a headset when used with any Bluetooth phone. (They'll also work with most tablets, including the iPad.)
The Logitech Wireless Speaker Adapter does one thing, and does it well: it adds Bluetooth wireless audio streaming to any stereo or speaker system with a free input. In other words: you'll be able to hear any music (or audio app) from a smartphone or iPad on the stereo across the room. Trust us, it's cool.
While we live in a cloud-based world of Google Docs and Dropbox, it never hurts to have a USB drive on hand for those quick and easy file transfers and backups. Our favorite is the metal LaCie Iamakey, which can reside on your keychain until needed. (Available in 4GB, 8GB, and 16GB configurations.)