Available in black or red, the iDM8 ($60 list, $50 online) reviewed here has a bulbous design and seems to be modeled after the top of a microphone (it's a little bigger than your typical singing microphone). It certainly is distinct-looking, feels substantial in your hand, and can be easily placed just about anywhere.
We had no problem pairing an iPhone 4S with the iDM8, which is compatible with all smartphones, tablets, laptops, and other devices that are Bluetooth-enabled (A2DP). Like other Bluetooth speakers, you can get about 30 feet away from the speaker before you start to lose your wireless audio connection. There's a volume control on the speaker, but most people will chose to set that at the highest level--or near it--and control volume from your phone or other portable device.
Sound quality is decent for a small speaker of this size, though not great. Like its step-up brother, the iDM11, it doesn't have as much bass as the Jambox and its sound isn't terribly detailed. However, most people should be impressed with what it can output and that it can play fairly loud. It'll fill a small room or office with sound, but you won't want to crank your tunes to the max because you'll get some distortion at high volumes, especially with bass-heavy music.
Unlike the iDM11 (or the Jambox), this model doesn't have a built-in microphone for speakerphone calls, but it does have a rechargeable battery. You charge the speaker via a cable that also doubles as an audio connection for non-Bluetooth devices. iHome calls this a 2-in-1 USB/3.5mm audio to micro USB cable. You basically plug the 3.5mm jack that's part of the cable into the headphone jack or auxiliary input on the device to output sound to the speaker. It works well enough, but if you lose the cable, you're out of luck.