I was checking out some of the UCSF Bioinformatics labs tonight and came across this link:
http://derisilab.ucsf.edu/index.php?page=3DFree 3D printing designs. While those aren't particularly special themselves, this is the first really practical application I've seen for 3D printing. Want another pipet rack? Print one out. Have a great idea for a pipet rack? Run off a few prototypes!