Compatible with: any computer (or device) with a 3.5mm audio jack
Requires: USB port for power
Price: $12.99 (on Amazon)
Proving once again that you get what you pay for, the Genius SP-115 speakers are a low-cost set of speakers for your computer. While these will work with the Mac on your desk, I think they are better suited to being travel companions where the price makes them almost disposable.
Coby Vitruvian Speaker System
Price: $59.99 US
The Coby Vitruvian is made for iPod and iPhone, as well as other MP3 players. It’s compatible with iPods that go back as far as the 3rd generation, so it’s a safe bet that your iPod will work with the Vitruvian. I tested my iPhone 3GS, first generation iPod Touch, and 60GB iPod Video (now known as iPod Classic).
Arctic Sound S111 Portable USB-powered Speakers
Company: Arctic Cooling
Price: $15.45 US
USB powered speaker are lousy, right? Wrong! The chilled-out company Arctic Cooling just released a hot pair of stereo speakers that can play anywhere, and they mean anywhere. No sound panel preference settings or software drivers are necessary. Plug the audio cable for this high-performance pair of stylish gray speakers into your audio device, then provide a USB power source and blast off. Stereo separation is terrific.