Inkjet printer head

Source: http://www.memscentral.com/famous_mems_products.htm

Piezoelectric Micro Pumps

Takasago Fluidic Systems
Datasheet https://goo.gl/a8GdUm
Piezo electric pump working

Dolomite
Datasheet https://goo.gl/EgSEl8

http://www.curiejet.com/en/products/list.php?pin=49600c3d3d05596e2da84e1774f0c398&type=c

MEMS Product List

http://blog.memsindustrygroup.org/mems-product-list/

Few examples of real MEMS products are:

http://www.eeherald.com/section/design-guide/mems_application_introduction.html

1. Adaptive Optics for Ophthalmic Applications 

2. Optical Cross Connects
3. Air Bag Accelerometers
4. Pressure Sensors
5. Mirror Arrays for Televisions and Displays
6. High Performance Steerable Micromirrors
7. RF MEMS Devices
8. Disposable Medical Devices
9. High Force, High Displacement Electrostatic Actuators
10. MEMS Devices for Secure Communications

MEMS devices used in Space exploration field include:

1. Accelerometers and gyroscopes for inertial navigation
2. Pressure sensors
3. RF switches and tunable filters for communication
4. Tunable mirror arrays for adaptive optics
5. Micro-power sources and turbines
6. Propulsion and attitude control
7. Bio-reactors and Bio-sensors, Microfluidics
8. Thermal control
9. Atomic clocks

MEMS devices for biomedical applications

http://electroiq.com/blog/2013/10/mems-devices-for-biomedical-applications/