Almost two years ago I've started making minfig scale models packed with functions. My first model was a small telehandler:

http://www.brickshelf.com/cgi-bin/gallery.cgi?f=292567

Yesterday I thoguht that it deserves a second version. So... here it is :)

General view:

Front wheels are steerable, and boom can be raised by a small pneumatic cylinder fed from small pump:

Boom raised and extended:

:

Galleries:

MOCPages

Brickshelf

Flickr

This is really nice. Probably the smallest model I've seen working pneumatics on.

Jesus I had to double take that, working Pnematics, very cool