Perhaps you once got on a smoothie-making kick, but fell out of it because you didn't like washing the blender. If so, then you might like the British-designed Millo. It's a smoothie-specific blender that's less of a hassle to wash, plus it's reportedly only a quarter as loud as a regular blender.
Millo consists of an aluminum base unit with spinning magnets inside of it, along with a 710-ml (24-oz) glass top that's used both as a mixing chamber and as a cup. The lid for that top is where the mixing blades are located.
When the top is filled with ingredients and placed upside-down on the base (so the lid is at the bottom, keeping the ingredients sealed inside), the magnets cause the blades to spin with very little friction – this is claimed to result in less noise, along with less heat generated and less power being required.
You then just pull the top of off the base, turn it right side-up, open the lid, drink the smoothie, then twist the lid right off and rinse off the blades.
The base can be started and stopped using a built-in touch control, although an iOS/Android app (currently in the works) will also let you fuss with settings such as blending speed. Additionally, multiple lids can wirelessly communicate via NFC with one base, automatically setting it to each user's chosen parameters – different users' favorite smoothies might have different blending speeds and times, for instance.
Millo is currently the subject of a Kickstarter campaign, where a pledge of £253 (about US$327) will get you one, when and if it reaches production. The planned retail price is £499 ($645).