Click on the link and have a peek at a working 7' tall grandfather clock made entirely of LEGO. This is one cool contraption!
"Eric Harshbarger stands next to a seven foot tall grandfather clock made from LEGO. The clock keeps accurate time, runs for 13+ hours before a weight reset is necessary, and all gears and such are 100% LEGO elements."
Slashdot has news of Logic Gates being made from LEGO - ask you favourite geek what that is if you're wondering.
And who can forget the LEGO
Spiderman movie. It's actually very well done, but please note that you need quicktime to view the video.